diff --git a/mobile/src/transport/rpc-client-runtime-events.test.ts b/mobile/src/transport/rpc-client-runtime-events.test.ts
index 04b2a90039e..ce035f63b0b 100644
--- a/mobile/src/transport/rpc-client-runtime-events.test.ts
+++ b/mobile/src/transport/rpc-client-runtime-events.test.ts
@@ -136,4 +136,30 @@ describe('runtime client-event stream disposal', () => {
     ])
     client.close()
   })
+
+  it('releases the replayed registration on the new socket when disposed before its ready', async () => {
+    const { client, socket: first } = connectReadyClient()
+    const unsubscribe = client.subscribe('runtime.clientEvents.subscribe', null, () => {})
+    const request = sentRequests(first, 'runtime.clientEvents.subscribe')[0]!
+    emitReady(first, request.id, 'runtime-events:first-socket')
+
+    first.close()
+    await vi.advanceTimersByTimeAsync(500)
+    const second = sockets.at(-1)!
+    expect(second).not.toBe(first)
+    second.open()
+    second.receive(JSON.stringify({ type: 'e2ee_ready' }))
+    second.receive('encrypted:{"type":"e2ee_authenticated"}')
+    expect(sentRequests(second, 'runtime.clientEvents.subscribe')).toEqual([
+      expect.objectContaining({ id: request.id })
+    ])
+
+    unsubscribe()
+    emitReady(second, request.id, 'runtime-events:second-socket')
+
+    expect(sentRequests(second, 'runtime.clientEvents.unsubscribe')).toEqual([
+      expect.objectContaining({ params: { subscriptionId: 'runtime-events:second-socket' } })
+    ])
+    client.close()
+  })
 })
diff --git a/mobile/src/transport/rpc-client-stream-registry.test.ts b/mobile/src/transport/rpc-client-stream-registry.test.ts
index 0e7d561be6e..5e3b7c1ad23 100644
--- a/mobile/src/transport/rpc-client-stream-registry.test.ts
+++ b/mobile/src/transport/rpc-client-stream-registry.test.ts
@@ -98,4 +98,105 @@ describe('RpcClientStreamRegistry', () => {
       params: { subscriptionId: 'browser-screencast:page-1:test' }
     })
   })
+
+  it('releases a replayed browser stream replaced by a new one before its ready', () => {
+    const { registry, sent } = createRegistry()
+    registry.subscribe('browser.screencast', { page: 'page-1' }, () => {})
+    const replayedId = sent[0]!.id
+    registry.handleResponse(
+      streamingResponse(replayedId, { type: 'ready', subscriptionId: 'page-1-old-connection' })
+    )
+
+    registry.markForReplay()
+    registry.replayAfterAuthentication()
+    registry.subscribe('browser.screencast', { page: 'page-2' }, () => {})
+    const replacementId = sent.at(-1)!.id
+    registry.handleResponse(
+      streamingResponse(replayedId, { type: 'ready', subscriptionId: 'page-1-new-connection' })
+    )
+    registry.handleResponse(
+      streamingResponse(replacementId, { type: 'ready', subscriptionId: 'page-2' })
+    )
+
+    expect(
+      sent
+        .filter((request) => request.method === 'browser.screencast.unsubscribe')
+        .map((request) => request.params)
+    ).toEqual([{ subscriptionId: 'page-1-new-connection' }])
+    expect(registry.size()).toBe(1)
+  })
+
+  describe.each([
+    ['runtime.clientEvents.subscribe', 'runtime.clientEvents.unsubscribe', null],
+    ['browser.screencast', 'browser.screencast.unsubscribe', { page: 'page-1' }]
+  ])('%s ready id across a replay', (method, unsubscribeMethod, params) => {
+    function unsubscribes(sent: SentRequest[]): unknown[] {
+      return sent.filter((request) => request.method === unsubscribeMethod).map((r) => r.params)
+    }
+
+    function subscribeReady() {
+      const harness = createRegistry()
+      const dispose = harness.registry.subscribe(method, params, () => {})
+      const requestId = harness.sent[0]!.id
+      harness.registry.handleResponse(
+        streamingResponse(requestId, { type: 'ready', subscriptionId: 'old-connection-id' })
+      )
+      return { ...harness, dispose, requestId }
+    }
+
+    it('releases the replayed registration when disposed before its new ready', () => {
+      const { registry, sent, dispose, requestId } = subscribeReady()
+
+      registry.markForReplay()
+      registry.replayAfterAuthentication()
+      dispose()
+      registry.handleResponse(
+        streamingResponse(requestId, { type: 'ready', subscriptionId: 'new-connection-id' })
+      )
+
+      expect(unsubscribes(sent)).toEqual([{ subscriptionId: 'new-connection-id' }])
+    })
+
+    it('forgets the previous connection id when marked for replay', () => {
+      const { registry, sent, dispose } = subscribeReady()
+
+      registry.markForReplay()
+      dispose()
+
+      // A disposal while disconnected has nothing to name on the next connection.
+      expect(unsubscribes(sent)).toEqual([])
+      expect(registry.size()).toBe(0)
+    })
+
+    it('still releases a stream cancelled before its first ready', () => {
+      const { registry, sent } = createRegistry()
+      const dispose = registry.subscribe(method, params, () => {})
+      const requestId = sent[0]!.id
+
+      dispose()
+      expect(unsubscribes(sent)).toEqual([])
+      registry.handleResponse(
+        streamingResponse(requestId, { type: 'ready', subscriptionId: 'first-id' })
+      )
+
+      expect(unsubscribes(sent)).toEqual([{ subscriptionId: 'first-id' }])
+      expect(registry.size()).toBe(0)
+    })
+
+    it('sends one unsubscribe however often the stream is disposed', () => {
+      const { registry, sent, dispose, requestId } = subscribeReady()
+
+      registry.markForReplay()
+      registry.replayAfterAuthentication()
+      dispose()
+      dispose()
+      registry.handleResponse(
+        streamingResponse(requestId, { type: 'ready', subscriptionId: 'new-connection-id' })
+      )
+      dispose()
+
+      expect(unsubscribes(sent)).toEqual([{ subscriptionId: 'new-connection-id' }])
+      expect(registry.size()).toBe(0)
+    })
+  })
 })
diff --git a/mobile/src/transport/rpc-client-stream-registry.ts b/mobile/src/transport/rpc-client-stream-registry.ts
index 68e50a6e6dd..78287be7ee1 100644
--- a/mobile/src/transport/rpc-client-stream-registry.ts
+++ b/mobile/src/transport/rpc-client-stream-registry.ts
@@ -108,6 +108,8 @@ export class RpcClientStreamRegistry {
     this.pendingBrowserRequestId = null
     for (const [id, stream] of this.streams) {
       stream.sent = false
+      // The id named a registration on the closed socket; the replay's ready brings the new one.
+      stream.subscriptionId = undefined
       this.resetTerminalRouting(id)
     }
   }