How to switch back from 5g to 2g?

The operation of switching back from 5g to 2g is as follows.

First, check whether your mobile phone is set to receive only 2g signals. If you don't try to plug your mobile phone card into another mobile phone, if it's the same 2G signal, then you can check the usage of your own traffic plan.

It's best to check your total traffic usage, or call the customer service hotline of the communication operator directly. If you reach the highest online level, you are restricted from using data traffic, and you can make calls and send and receive short messages normally, but you can't connect to the data network.