diff --git a/components/email/__tests__/mv-conversation-expand.test.tsx b/components/email/__tests__/mv-conversation-expand.test.tsx
index 21056b2e4..e2994bb48 100644
--- a/components/email/__tests__/mv-conversation-expand.test.tsx
+++ b/components/email/__tests__/mv-conversation-expand.test.tsx
@@ -131,7 +131,7 @@ describe('Mountain View conversation folding (#1222)', () => {
       />,
     );
     const header = container.querySelector('[data-mv-conversation-expanded][data-email-id="m1"] [data-mv-conversation-header]')!;
-    fireEvent.click(header.querySelector('button')!);
+    fireEvent.click(header.querySelector('button[aria-label]')!);
     expect(onReply).toHaveBeenCalledWith(expect.objectContaining({ id: 'm1' }));
     expect(expandedIds(container)).toEqual(['m1', 'm2']);
 
diff --git a/components/email/__tests__/mv-conversation-phone.test.tsx b/components/email/__tests__/mv-conversation-phone.test.tsx
new file mode 100644
index 000000000..ec015e2b1
--- /dev/null
+++ b/components/email/__tests__/mv-conversation-phone.test.tsx
@@ -0,0 +1,116 @@
+import { render, screen, fireEvent } from '@testing-library/react';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import type { Email, Mailbox } from '@/lib/jmap/types';
+import { useSettingsStore } from '@/stores/settings-store';
+
+// #1224: on the phone Mountain View showed threads in a separate view, newest
+// first and without the to/cc/bcc details. The phone viewer now draws the same
+// conversation as the desktop one: oldest first, every message foldable, and
+// each unfolded message has its own details.
+
+vi.mock('@/hooks/use-media-query', () => ({
+  useDeviceDetection: () => ({ isMobile: true, isTablet: false, isDesktop: false }),
+  useMediaQuery: () => false,
+}));
+
+vi.mock('@/components/tour/tour-provider', () => ({
+  useTour: () => ({ activeTour: null, startTour: vi.fn(), endTour: vi.fn(), registerStep: vi.fn() }),
+}));
+
+vi.mock('@/components/plugins/plugin-slot', () => ({
+  PluginSlot: () => null,
+}));
+
+vi.mock('@/hooks/use-plugin-slot-offers', () => ({
+  usePluginSlotOffers: () => [],
+}));
+
+class NoopResizeObserver {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+vi.stubGlobal('ResizeObserver', NoopResizeObserver);
+
+const { EmailViewer } = await import('../email-viewer');
+
+const mailboxes: Mailbox[] = [
+  { id: 'inbox', name: 'Inbox', role: 'inbox', parentId: null, myRights: { mayAddItems: true } },
+] as unknown as Mailbox[];
+
+function mail(n: number, overrides: Partial<Email> = {}): Email {
+  return {
+    id: `m${n}`,
+    blobId: `b${n}`,
+    threadId: 't1',
+    mailboxIds: { inbox: true },
+    keywords: { $seen: true },
+    from: [{ name: `Sender ${n}`, email: `s${n}@example.com` }],
+    to: [{ name: 'Me', email: 'me@example.com' }],
+    subject: 'Subject',
+    receivedAt: `2026-01-0${n}T10:00:00Z`,
+    preview: `Preview ${n}`,
+    hasAttachment: false,
+    size: 100,
+    textBody: [{ partId: '1', type: 'text/plain' }],
+    htmlBody: [],
+    attachments: [],
+    bodyValues: { '1': { value: `Body ${n}`, isTruncated: false } },
+    ...overrides,
+  } as unknown as Email;
+}
+
+const cardIds = (c: HTMLElement) =>
+  [...c.querySelectorAll('[data-mv-conversation-card], [data-mv-conversation-expanded]')].map((e) => e.getAttribute('data-email-id'));
+
+describe('Mountain View conversation on the phone (#1224)', () => {
+  beforeEach(() => {
+    useSettingsStore.setState({ interfaceLayout: 'mountain-view', markAsReadDelay: -1 });
+  });
+
+  it('draws the conversation oldest first around the open message', () => {
+    const open = mail(3);
+    const { container } = render(
+      <EmailViewer email={open} mailboxes={mailboxes} selectedMailbox="inbox" currentMailboxRole="inbox"
+        mvConversation={[mail(1), mail(2), open]} />,
+    );
+    expect(cardIds(container)).toEqual(['m1', 'm2']);
+    const before = container.querySelector('[data-mv-conversation-before]')!;
+    const openHeader = container.querySelector('[data-mv-open-header-mobile]')!;
+    expect(before.compareDocumentPosition(openHeader) & Node.DOCUMENT_POSITION_FOLLOWING).toBeTruthy();
+  });
+
+  it('shows cc and bcc of an unfolded message in its details', () => {
+    const older = mail(1, {
+      cc: [{ name: 'Carol', email: 'carol@example.com' }],
+      bcc: [{ name: 'Dave', email: 'dave@example.com' }],
+    });
+    const open = mail(2);
+    const { container } = render(
+      <EmailViewer email={open} mailboxes={mailboxes} selectedMailbox="inbox" currentMailboxRole="inbox"
+        mvConversation={[older, open]} />,
+    );
+    fireEvent.click(screen.getByText('Sender 1'));
+    expect(container.querySelector('[data-mv-conversation-details]')).toBeNull();
+
+    fireEvent.click(container.querySelector('[data-mv-conversation-details-toggle]')!);
+    const details = container.querySelector('[data-mv-conversation-details]') as HTMLElement;
+    expect(details).not.toBeNull();
+    expect(details.textContent).toContain('Carol <carol@example.com>');
+    expect(details.textContent).toContain('Dave <dave@example.com>');
+    // The toggle does not fold the message it sits in.
+    expect(cardIds(container)).toEqual(['m1']);
+    expect(container.querySelector('[data-mv-conversation-expanded]')).not.toBeNull();
+  });
+
+  it('folds the open message from its phone sender line', () => {
+    const open = mail(2);
+    const { container } = render(
+      <EmailViewer email={open} mailboxes={mailboxes} selectedMailbox="inbox" currentMailboxRole="inbox"
+        mvConversation={[mail(1), open]} />,
+    );
+    fireEvent.click(container.querySelector('[data-mv-open-header-mobile]')!);
+    expect(container.querySelector('[data-mv-open-folded]')).not.toBeNull();
+    expect(cardIds(container)).toEqual(['m1', 'm2']);
+  });
+});
diff --git a/components/email/__tests__/thread-list-item.test.tsx b/components/email/__tests__/thread-list-item.test.tsx
index df972f2eb..340bd02c9 100644
--- a/components/email/__tests__/thread-list-item.test.tsx
+++ b/components/email/__tests__/thread-list-item.test.tsx
@@ -256,6 +256,46 @@ describe('ThreadListItem row content', () => {
   });
 });
 
+describe('ThreadListItem opening a thread on the phone', () => {
+  const twoMessageThread = () => groupEmailsByThread([
+    makeEmail({ id: 'older', receivedAt: '2024-01-14T10:00:00Z' }),
+    makeEmail({ id: 'newer', receivedAt: '2024-01-15T10:00:00Z' }),
+  ])[0];
+
+  function tap(interfaceLayout: 'mountain-view' | 'default') {
+    useSettingsStore.setState({ interfaceLayout, mailLayout: 'split' });
+    useUIStore.setState({ isMobile: true, isTablet: false, isDesktop: false });
+    useEmailStore.setState({ selectedEmailKeys: new Set<string>(), selectedMailbox: 'inbox' });
+    const onEmailSelect = vi.fn();
+    const onOpenConversation = vi.fn();
+    render(
+      <ThreadListItem
+        thread={twoMessageThread()}
+        isExpanded={false}
+        onToggleExpand={() => {}}
+        onEmailSelect={onEmailSelect}
+        onOpenConversation={onOpenConversation}
+      />,
+    );
+    fireEvent.click(screen.getByText('Test Subject'));
+    return { onEmailSelect, onOpenConversation };
+  }
+
+  // #1224: the phone thread view lists newest first and has no details, so
+  // Mountain View opens the thread in the viewer, as on the desktop.
+  it('opens the latest message in the viewer in Mountain View', () => {
+    const { onEmailSelect, onOpenConversation } = tap('mountain-view');
+    expect(onOpenConversation).not.toHaveBeenCalled();
+    expect(onEmailSelect).toHaveBeenCalledWith(expect.objectContaining({ id: 'newer' }));
+  });
+
+  it('keeps the phone thread view in the default layout', () => {
+    const { onEmailSelect, onOpenConversation } = tap('default');
+    expect(onOpenConversation).toHaveBeenCalledTimes(1);
+    expect(onEmailSelect).not.toHaveBeenCalled();
+  });
+});
+
 describe('ThreadListItem Mountain View phone row layout', () => {
   it('sets the star at the end of the preview line, not under the time', () => {
     useSettingsStore.setState({ interfaceLayout: 'mountain-view', mailLayout: 'split', showPreview: true, density: 'regular' } as never);
diff --git a/components/email/email-viewer.tsx b/components/email/email-viewer.tsx
index e57c39f7b..f184fea57 100644
--- a/components/email/email-viewer.tsx
+++ b/components/email/email-viewer.tsx
@@ -678,7 +678,7 @@ function mvSenderDate(date: Date | string, timeFormat: '12h' | '24h'): string {
  * One message of a Mountain View conversation, folded to its sender, date and
  * snippet. Clicking it unfolds the message in place.
  */
-function MvConversationCard({ email, onOpen, timeFormat }: { email: Email; onOpen?: (email: Email) => void; timeFormat: '12h' | '24h' }) {
+function MvConversationCard({ email, onOpen, timeFormat, compact }: { email: Email; onOpen?: (email: Email) => void; timeFormat: '12h' | '24h'; compact?: boolean }) {
   const sender = email.from?.[0];
   const unread = !email.keywords?.$seen;
   return (
@@ -687,7 +687,7 @@ function MvConversationCard({ email, onOpen, timeFormat }: { email: Email; onOpe
       onClick={() => onOpen?.(email)}
       data-mv-conversation-card=""
       data-email-id={email.id}
-      className="w-full flex items-start gap-4 px-6 py-3 border-t border-border text-start hover:bg-muted/40 transition-colors"
+      className={cn("w-full flex items-start py-3 border-t border-border text-start hover:bg-muted/40 transition-colors", compact ? "gap-3 px-4" : "gap-4 px-6")}
     >
       <Avatar name={sender?.name} email={sender?.email} size="md" className="w-10 h-10 flex-shrink-0" />
       <span className="flex-1 min-w-0">
@@ -696,7 +696,7 @@ function MvConversationCard({ email, onOpen, timeFormat }: { email: Email; onOpe
             {sender?.name || sender?.email || ''}
           </span>
           <span className="ms-auto ps-2 text-xs text-muted-foreground whitespace-nowrap">
-            {mvSenderDate(email.receivedAt, timeFormat)}
+            {compact ? formatDate(email.receivedAt) : mvSenderDate(email.receivedAt, timeFormat)}
           </span>
         </span>
         <span className="block text-sm text-muted-foreground truncate">{cleanPreview(email.preview)}</span>
@@ -711,6 +711,39 @@ function isInteractiveClick(target: EventTarget | null, container: HTMLElement):
   return !!el && el !== container && container.contains(el);
 }
 
+/**
+ * The sender, recipients, dates and ids of an unfolded conversation message,
+ * as the open message's details panel lists them.
+ */
+function MvConversationDetails({ email, timeFormat, className }: { email: Email; timeFormat: '12h' | '24h'; className?: string }) {
+  const t = useTranslations('email_viewer');
+  const addresses = (list?: { name?: string | null; email?: string | null }[]) =>
+    (list ?? []).map((a) => (a.name && a.email ? `${a.name} <${a.email}>` : a.email || a.name || '')).join(', ');
+  const fullDate = (iso: string) =>
+    formatDateTime(iso, timeFormat, { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' });
+  const rows: [string, string | undefined][] = [
+    [t('from'), addresses(email.from)],
+    [t('reply_to_label').replace(':', ''), addresses(email.replyTo)],
+    [t('to'), addresses(email.to)],
+    [t('cc'), addresses(email.cc)],
+    [t('bcc'), addresses(email.bcc)],
+    [t('details.sent'), email.sentAt ? fullDate(email.sentAt) : undefined],
+    [t('details.received'), fullDate(email.receivedAt)],
+    [t('subject'), email.subject],
+    [t('headers.message_id'), email.messageId],
+  ];
+  return (
+    <dl className={cn("grid grid-cols-[auto_1fr] gap-x-4 gap-y-1 pb-3 text-xs", className)} data-mv-conversation-details="">
+      {rows.filter(([, value]) => value).map(([label, value]) => (
+        <Fragment key={label}>
+          <dt className="text-muted-foreground">{label}</dt>
+          <dd className="text-foreground min-w-0 break-words">{value}</dd>
+        </Fragment>
+      ))}
+    </dl>
+  );
+}
+
 /**
  * A message of a Mountain View conversation unfolded in place: its sender line,
  * which folds it again when clicked, and its body. The list fetch carries no
@@ -724,9 +757,11 @@ export function MvExpandedConversationCard({
   onMarkRead,
   onReply,
   onDownloadAttachment,
+  compact,
 }: {
   email: Email;
   timeFormat: '12h' | '24h';
+  compact?: boolean;
   onCollapse: (email: Email) => void;
   onLoadBody?: (email: Email) => void;
   onMarkRead?: (email: Email) => void;
@@ -737,6 +772,7 @@ export function MvExpandedConversationCard({
   const externalContent = useConversationExternalContent();
   const sender = email.from?.[0];
   const hasBody = !!email.bodyValues;
+  const [showDetails, setShowDetails] = useState(false);
   const loadRequested = useRef(false);
   useEffect(() => {
     if (hasBody || loadRequested.current || !onLoadBody) return;
@@ -765,24 +801,33 @@ export function MvExpandedConversationCard({
           }
         }}
         data-mv-conversation-header=""
-        className="flex items-start gap-4 px-6 pt-3 pb-2 cursor-pointer"
+        className={cn("flex items-start pt-3 pb-2 cursor-pointer", compact ? "gap-3 px-4" : "gap-4 px-6")}
       >
         <Avatar name={sender?.name} email={sender?.email} size="md" className="w-10 h-10 flex-shrink-0" />
         <span className="flex-1 min-w-0">
           <span className="flex items-baseline gap-2">
             <span className="text-sm font-semibold truncate">{sender?.name || sender?.email || ''}</span>
-            {sender?.name && sender.email && (
+            {!compact && sender?.name && sender.email && (
               <span className="text-xs text-muted-foreground truncate">&lt;{sender.email}&gt;</span>
             )}
             <span className="ms-auto ps-2 text-xs text-muted-foreground whitespace-nowrap">
-              {mvSenderDate(email.receivedAt, timeFormat)}
+              {compact ? formatDate(email.receivedAt) : mvSenderDate(email.receivedAt, timeFormat)}
             </span>
           </span>
-          {email.to && email.to.length > 0 && (
-            <span className="block text-xs text-muted-foreground truncate">
-              {t('to')} {email.to.map((a) => a.name || a.email).join(', ')}
+          <button
+            type="button"
+            onClick={() => setShowDetails((v) => !v)}
+            aria-expanded={showDetails}
+            data-mv-conversation-details-toggle=""
+            className="flex items-center gap-0.5 max-w-full text-xs text-muted-foreground hover:text-foreground transition-colors"
+          >
+            <span className="truncate">
+              {email.to && email.to.length > 0
+                ? `${t('to')} ${email.to.map((a) => a.name || a.email).join(', ')}`
+                : t(showDetails ? 'hide_details' : 'show_details')}
             </span>
-          )}
+            {showDetails ? <ChevronUp className="w-3 h-3 flex-shrink-0" /> : <ChevronDown className="w-3 h-3 flex-shrink-0" />}
+          </button>
         </span>
         {onReply && (
           <button
@@ -796,6 +841,7 @@ export function MvExpandedConversationCard({
           </button>
         )}
       </div>
+      {showDetails && <MvConversationDetails email={email} timeFormat={timeFormat} className={compact ? "px-4" : "ps-[80px] pe-6"} />}
       {hasBody ? (
         <ConversationEmailBody
           email={email}
@@ -803,11 +849,11 @@ export function MvExpandedConversationCard({
           onAllowExternal={() => externalContent.allow(email.id)}
           onTrustSender={externalContent.trustSender(email)}
           onDownloadAttachment={onDownloadAttachment}
-          className="ps-[80px] pe-6 pb-4"
+          className={cn("pb-4", compact ? "px-4" : "ps-[80px] pe-6")}
           bodyStyle={{ paddingBlock: '0.25rem 0.5rem' }}
         />
       ) : (
-        <div className="ps-[80px] pe-6 pb-4 pt-1 space-y-2 animate-pulse" data-mv-conversation-loading="">
+        <div className={cn("pb-4 pt-1 space-y-2 animate-pulse", compact ? "px-4" : "ps-[80px] pe-6")} data-mv-conversation-loading="">
           <div className="h-2 bg-muted rounded w-full" />
           <div className="h-2 bg-muted rounded w-5/6" />
           <div className="h-2 bg-muted rounded w-4/6" />
@@ -822,8 +868,9 @@ export function MvExpandedConversationCard({
  * run of folded messages before it shows only its first and last message
  * around a count, as Gmail does, and the count unfolds the rest.
  */
-export function MvConversationRun({ emails, onOpen, timeFormat, collapseLongRun, expandedIds, renderExpanded }: {
+export function MvConversationRun({ emails, onOpen, timeFormat, collapseLongRun, expandedIds, renderExpanded, compact }: {
   emails: Email[];
+  compact?: boolean;
   /** A folded message was clicked. */
   onOpen?: (email: Email) => void;
   timeFormat: '12h' | '24h';
@@ -836,7 +883,7 @@ export function MvConversationRun({ emails, onOpen, timeFormat, collapseLongRun,
   const isExpanded = (e: Email) => !!renderExpanded && !!expandedIds?.has(e.id);
   const renderOne = (e: Email) => isExpanded(e)
     ? <Fragment key={e.id}>{renderExpanded!(e)}</Fragment>
-    : <MvConversationCard key={e.id} email={e} onOpen={onOpen} timeFormat={timeFormat} />;
+    : <MvConversationCard key={e.id} email={e} onOpen={onOpen} timeFormat={timeFormat} compact={compact} />;
   const middle = emails.slice(1, -1);
   if (!collapseLongRun || showAll || emails.length <= 3 || middle.some(isExpanded)) {
     return <>{emails.map(renderOne)}</>;
@@ -1050,7 +1097,7 @@ export function EmailViewer({
   const mvMobileViewer = interfaceLayout === 'mountain-view' && isMobile;
   const mvReplyRow = mvViewer || mvMobileViewer;
   // The open conversation around the open message, split at it.
-  const mvOpenIndex = mvViewer && mvConversation && email ? mvConversation.findIndex((e) => e.id === email.id) : -1;
+  const mvOpenIndex = (mvViewer || mvMobileViewer) && mvConversation && email ? mvConversation.findIndex((e) => e.id === email.id) : -1;
   const mvBefore = mvOpenIndex > 0 ? mvConversation!.slice(0, mvOpenIndex) : [];
   const mvAfter = mvOpenIndex >= 0 ? mvConversation!.slice(mvOpenIndex + 1) : [];
   // Mountain View: which other messages of the conversation are unfolded. A
@@ -1089,6 +1136,7 @@ export function EmailViewer({
       onMarkRead={onMarkConversationEmailRead}
       onReply={onReplyConversationEmail}
       onDownloadAttachment={onDownloadAttachment}
+      compact={mvMobileViewer}
     />
   );
   // Mountain View's toolbars are icon-only, on the phone as on the desktop.
@@ -4320,16 +4368,16 @@ export function EmailViewer({
       <div className="min-h-full flex flex-col">
 
       {/* Mountain View: the conversation's earlier messages, folded. */}
-      {mvViewer && mvBefore.length > 0 && (
-        <div className="hidden lg:block" data-mv-conversation-before="">
-          <MvConversationRun emails={mvBefore} onOpen={toggleMvExpanded} expandedIds={mvExpandedIds} renderExpanded={renderMvExpanded} timeFormat={timeFormat} collapseLongRun />
+      {mvBefore.length > 0 && (
+        <div data-mv-conversation-before="">
+          <MvConversationRun emails={mvBefore} onOpen={toggleMvExpanded} expandedIds={mvExpandedIds} renderExpanded={renderMvExpanded} timeFormat={timeFormat} compact={mvMobileViewer} collapseLongRun />
         </div>
       )}
 
       {/* Mountain View: the open message folded like the rest of the conversation. */}
       {mvOpenFolded && email ? (
-        <div className="hidden lg:block" data-mv-open-folded="">
-          <MvConversationCard email={email} onOpen={() => setMvOpenCollapsed(false)} timeFormat={timeFormat} />
+        <div data-mv-open-folded="">
+          <MvConversationCard email={email} onOpen={() => setMvOpenCollapsed(false)} timeFormat={timeFormat} compact={mvMobileViewer} />
         </div>
       ) : (<>
       {/* === SENDER INFO (Desktop) === */}
@@ -4653,7 +4701,16 @@ export function EmailViewer({
       </div>
 
         {/* Mobile/Tablet Sender Info - scrolls with content */}
-        <div className="lg:hidden bg-background border-b border-border px-4" style={{ paddingBlock: 'var(--density-header-py)' }}>
+        <div
+          className={cn("lg:hidden bg-background border-b border-border px-4", mvOpenIndex >= 0 && "cursor-pointer", mvOpenIndex >= 0 && mvBefore.length > 0 && "border-t")}
+          style={{ paddingBlock: 'var(--density-header-py)' }}
+          data-mv-open-header-mobile={mvOpenIndex >= 0 ? "" : undefined}
+          onClick={mvOpenIndex >= 0 ? (e) => {
+            if (isInteractiveClick(e.target, e.currentTarget)) return;
+            if (window.getSelection()?.toString()) return;
+            setMvOpenCollapsed(true);
+          } : undefined}
+        >
           <div className="flex items-start" style={{ gap: 'var(--density-item-gap)' }}>
             <button
               onClick={() => sender?.email && handleViewContactSidebar(null, sender.email)}
@@ -5731,9 +5788,9 @@ export function EmailViewer({
           <PluginSlot name="email-footer" />
 
           {/* Mountain View: the conversation's later messages, folded. */}
-          {mvViewer && mvAfter.length > 0 && (
-            <div className="hidden lg:block mt-4 border-b border-border" data-mv-conversation-after="">
-              <MvConversationRun emails={mvAfter} onOpen={toggleMvExpanded} expandedIds={mvExpandedIds} renderExpanded={renderMvExpanded} timeFormat={timeFormat} />
+          {mvAfter.length > 0 && (
+            <div className="mt-4 border-b border-border" data-mv-conversation-after="">
+              <MvConversationRun emails={mvAfter} onOpen={toggleMvExpanded} expandedIds={mvExpandedIds} renderExpanded={renderMvExpanded} timeFormat={timeFormat} compact={mvMobileViewer} />
             </div>
           )}
 
diff --git a/components/email/thread-list-item.tsx b/components/email/thread-list-item.tsx
index 45e73924a..4699cd877 100644
--- a/components/email/thread-list-item.tsx
+++ b/components/email/thread-list-item.tsx
@@ -962,14 +962,15 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
         return;
       }
 
-      if (isMobile && onOpenConversation) {
+      // Mountain View opens the conversation in the reading pane, as Gmail
+      // does, rather than unfolding it inside the list. On the phone too: the
+      // separate phone thread view would list it newest first. (#1224)
+      if (isMobile && onOpenConversation && !mvMobileRow) {
         onOpenConversation(thread);
         return;
       }
 
-      // Mountain View opens the conversation in the reading pane, as Gmail
-      // does, rather than unfolding it inside the list.
-      if (mvRow) {
+      if (mvRow || mvMobileRow) {
         if (selectedEmailKeys.size > 0) clearSelection();
         onEmailSelect(latestEmail);
         return;
diff --git a/components/mail/mail-app.tsx b/components/mail/mail-app.tsx
index 751a01633..08106106b 100644
--- a/components/mail/mail-app.tsx
+++ b/components/mail/mail-app.tsx
@@ -379,6 +379,9 @@ export function MailApp({ linkSegments: routeSegments }: MailAppProps = {}) {
   // one-pane flow, with Mountain View's own app chrome.
   const mvShell = interfaceLayout === 'mountain-view' && !isMobile && !isTablet && !isEmbedded;
   const mvMobile = interfaceLayout === 'mountain-view' && isMobile && !isEmbedded;
+  // Mountain View reads a thread as one conversation in the viewer, on the
+  // phone as on the desktop, so both show the same order and details. (#1224)
+  const mvConversationView = mvShell || mvMobile;
   // Pane hosting (Pro shell). When this app renders inside a Pro pane, the
   // pane publishes its width and id; `isMobile` above is then pane-based,
   // and layout that would use viewport-fixed positioning must scope itself
@@ -3558,8 +3561,8 @@ export function MailApp({ linkSegments: routeSegments }: MailAppProps = {}) {
 
   // Mountain View reads a message inside its conversation, as Gmail does: load
   // the rest of the thread (list properties only) whenever another opens.
-  const mvConversationThreadId = mvShell && !cursorOnly ? (selectedEmail?.threadId ?? null) : null;
-  const mvConversationRef = mvShell && !cursorOnly ? selectedEmail : null;
+  const mvConversationThreadId = mvConversationView && !cursorOnly ? (selectedEmail?.threadId ?? null) : null;
+  const mvConversationRef = mvConversationView && !cursorOnly ? selectedEmail : null;
   const mvConversationRoute = (ref: Email, fallback: NonNullable<typeof client>) => {
     const route = resolveThreadRoute({ isUnifiedView, ref, mailboxes: viewMailboxes, selectedMailbox });
     const threadClient = route.clientAccountId
@@ -4833,10 +4836,10 @@ export function MailApp({ linkSegments: routeSegments }: MailAppProps = {}) {
                       total: Math.max(activeEmails.length, mailboxes.find((mb) => mb.id === selectedMailbox)?.totalEmails ?? 0),
                     } : undefined}
                     mvFolderName={mvShell && !isScheduledView && !isUnifiedView ? currentMailboxName : undefined}
-                    mvConversation={mvShell ? mvConversation ?? undefined : undefined}
-                    onLoadConversationEmail={mvShell ? (e) => void handleLoadConversationEmail(e) : undefined}
-                    onMarkConversationEmailRead={mvShell ? (e) => void handleMarkConversationEmailRead(e) : undefined}
-                    onReplyConversationEmail={mvShell ? async (e) => {
+                    mvConversation={mvConversationView ? mvConversation ?? undefined : undefined}
+                    onLoadConversationEmail={mvConversationView ? (e) => void handleLoadConversationEmail(e) : undefined}
+                    onMarkConversationEmailRead={mvConversationView ? (e) => void handleMarkConversationEmailRead(e) : undefined}
+                    onReplyConversationEmail={mvConversationView ? async (e) => {
                       // The reply quotes the message, so it needs the body.
                       const full = e.bodyValues ? e : await handleLoadConversationEmail(e);
                       await handleConversationReply(full ?? e);