@fiber666 that's because you are not getting volte. Dial
>phone information > 3 dot menu on top> show ims status. There Voice over LTE should be Available. If they are not giving you this, call their customer care. Vi Volte had a lot of complaints.
Without volte the phone will need to switch to 3g to receive calls.
Code:
*#*#4636#*#*
Without volte the phone will need to switch to 3g to receive calls.
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