Why do mobile phones receive two identical messages?

This is not a problem with your mobile phone, but a problem with the network signal transmission of the mobile company! Sometimes there will be mistakes in transmitting information, and sometimes I will have such a situation! Sometimes even three or four pieces of the same information will appear continuously! My friends also told me that this kind of thing sometimes happens to them! Ask the sender, they all say just send one! Sometimes I send messages to others, and others will receive several duplicate messages! Don't worry, it's not the phone! I can assure you!