I have a FP 3 and tested a couple of SIM cards after the 2G/3G shutdown. Maybe this helps someone. Here is the summary:
- Comviq (network: Tele2): No calls possible. The menu option to enable VoLTE/4G is missing.
- hallon (network: Tre): Calls possible after enabling VoLTE in the menu. However, the phone number of incoming calls isn’t shown (just “unknown number”). Hallon’s support just sent me a generic response that did not solve the problem.
- Telenor: Calls work and the phone number of incoming calls is shown (after enabling 4G calls).
- Vimla (network: Telenor): Same as Telenor itself, that is, everything works as it should.
- Telia: I’m using this on the second SIM card via roaming. For that, everything works as well. (Telia hasn’t shut down 2G/3G, but I enabled 4G calls for the SIM card.)
That said, I’m aware that emergency calling probably doesn’t work.