I got a planetsim, one of those providers with estonian/uk numbers for travelers. I'm trying to make a phone call, i receive an ussd "wait for call" and then my device is supposed to ring but it doesn't. Incoming calls don't work either, the other party hear it's ringing but my device is not. My provider told me to enter the settings menu with a code they gave me, and set CC OPTION X:ON As this didn't work either, they suggests i change device. So i report the bug here. I'm not sure if this is related
I didn't find the right solution from the Internet.