The export declared VERSION:3.0 but wrote vCard 4.0 syntax, and wrote the JSContact phone feature \"mobile\" as TYPE=MOBILE, which is no vCard type, so importers dropped such numbers.
- Declare VERSION:4.0 and write 4.0 throughout: basic-format dates and timestamps, data: URIs for inline media, VALUE=text for a UID or RELATED that is no URI, geo: URIs, lines folded at 75 octets, CRLF after every line, and the webmail's own PRODID.
- Map "mobile" to CELL and back; MAIN-NUMBER and x- types are kept.
- Write N before FN: some importers ignore the name otherwise.
- The contact form stores mobile phones as "mobile" (RFC 9553) and still reads the "cell" it used to write.
Julien Béti
a3fdd72763