Whisperfish - The unofficial SailfishOS Signal client

I just tested after:

  1. Creating a new Volla with 4.1
  2. simple install from storeman/openrepos
  3. nothing more than login.

It seems as if the SIM is sufficient, a new device is added and it’s just a go. Works fine.

This was NOT an upgrade, so I would guess your mileage will vary.