Cell phones can't make phone calls and send text messages. What's going on here?

Check whether the carrier server has not released the cache of your mobile phone number:

At this time, you should call Unicom or mobile customer service hotline and find someone to help you refresh the cache and network. This is not difficult to do, just make a phone call.

Put the mobile phone card on another mobile phone to test whether there is any problem with the card:

This program is not difficult either. If it can be used on other mobile phones, there is something wrong with your mobile phone. To repair or replace it.

Turn off the phone 10 minutes before turning it on;

Sometimes the network will be blocked, so the network will be disconnected when it is turned off, and even okl will be turned on. This method can generally be used by telephone.

Test the cell phone signal in another environment (area):

Do you have many reinforced concrete buildings in your area? If so, this band may have bypassed your mobile phone.

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Go directly to the business hall of the operator (Unicom or mobile or telecom) to replace the new sim card:

If you feel that your mobile phone card has been used for a long time and the chip contact is not good, just go to the business hall to change the card. Give them the original sim card and get a new one for free.

Mobile phone cards and mobile phones sometimes have problems.

At present, the most stable thing is mobile, and China Unicom is almost.