Xiaomi suddenly can't make a phone call, answer the phone or send a text message. Everything else can be used up.

1, mobile phone soft fault, restart mobile phone test.

2. Check whether the phone center number is correct (usually in SMS settings). Sometimes this happens when you change the card and then change it back.

3. Sometimes this happens when the phone stops paying. Just dial 10086, refresh the SMS function, and then restart.

4, mobile phone quality problems, contact after-sales solution.