LG's phone can't be called, can't be answered, and can't send and receive messages. What happened?

Look at the phone center number! There is a mode setting in the SMS settings, and there is a SMS center number in it, to see if it is wrong, or to accidentally delete a number. The number of SMS center is different in different provinces, even in different areas of the province, so you should check it online, then look at your friend's mobile phone and the center number of your area, and remember to enter the front +86!

Remember to give me extra points when solving the problem! Hmm. How interesting ....