SMS notification of mobile phone card exists. What if there is no signal?

1, you can turn off the phone for 3-5 minutes, then restart the phone and try again;

2. Confirm whether there is a network. I suggest you use it in a place with strong signal.

3. Check whether the USIM card is inserted. If it is plugged in and still doesn't work, I suggest you go to the business hall to check whether the USIM card is faulty.