Xiaomi 9t won't make or receive calls

There are several potential solutions to this issue that have been suggested by different sources. One of the most common suggestions is to check if call barring has been accidentally turned on. Call barring is a feature that blocks incoming and outgoing calls, and if activated, it can prevent any calls from being made or received1. It can be deactivated by going into the phone settings and turning off call barring. The default barring password, if required, is usually 1919