I updated my no nokia6(7.1.2) to Oreo, for the first day it went well but from next day i'm not able to make calls even when my signal bar is full. It is showing "mobile network not available" when i try to make a call. On rebooting its working as intended to work and after 15 mins the problem persists. I tried with different sims(4G) in slot1 found same issue but when i use a 2G sim in slot1 its doing good. The same sim card working fine in the Sim slot 2.
Tried this and there is no change. The only change is i lost all my data ☺.Thank you anyway