Hi I did some more testing and I am actually not convinced anymore, my problem was directly related to VoLTE. However, thanks to your continuous support I found the issue. I think it was a conflict between the active calling Sim and the preferred data sim. I was able to.solve the issue by changing a setting. Let me explain:
I have two sims in my phone:
- Sim 1: Carrier: Swisscom, VoLTE (4G calling) activated
- Sim 2: Carrier: Sunrise, VoLTE (4G calling activated
- Main Sim for Data: Sim 1
Issue (found these details only because your questions, thanks again):
- When I received a call on SIM 1, I was able to surf the internet during the call. All good, VoLTE working)
- When I received (or made) a call with Sim 2, I did not have any internet. Probably because the phone was busy with the ongoing call on Sim 2, and could therefore not use the selected main data Sim (Sim 1) at the same time.
Solution: in the settings for SIM2 I had to activate "Data during calls, temporary use Sim's 2 Data during VoLTE calls...."
Now everything works..
Thanks again
