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Hi
My Xaomi Redmi Note 8 Pro and my mother's REdmi Note 7 can send and receive sms but can't make or receive calls. CAlls in go to voicemail but since I can't dial 121 from the phone becuase it won't make calls I can't listen to the voicemails. BOth phones are successfully connected to TPG LTE according to the network status.
What can I do?
Further detail. Both phones could make calls until about 2 weeks ago
I'm having the same problem on a Xiaomi Redmi K20 Pro. My gut is telling me we've been cancelled!
HiDigimont
See solution I just posted
SOLUTION
Dial *#*#86583#*#*
turn phone off and on again
go to settings>SIM cards and mobile networks>select SIM 1 or SIM 2 TPG>Turn on Use VoLTE
If Use VoLTE does not appear dial the code again and it shoudl appear.
TPG call centre stepped me throught his after a 50 minute wait on hold
NOte the above code only works with Xiaomi phones
Other phones follow same process but may use different code
I actually found this solution online myself and was coming here to close this and also to tell you how to do it!
Thanks for sharing this resolution in the Community as it will help other readers with the same brand or device.
Have a great day!