Huawei's mobile phone suddenly showed "no service" today, so it was impossible to make a call and get in "prompt to turn it off".

According to the information you provided, if you mean that the mobile phone is "out of service", you can detect it in the following ways:

1. Please confirm whether your mobile phone is set to airplane mode;

2. Please confirm whether your mobile phone is in arrears;

3. You can go to a place with a good signal and restart the machine;

4. You can try the card on your mobile phone or put it on other mobile phones. If it can be used normally, I suggest you go to the business hall for testing.

If not, it may be caused by the mobile phone system. You can go to the mobile phone repair point to check your mobile phone.

If not, please contact the local Unicom manual customer service for consultation.