I just received a text message five years ago. Who can give me an explanation?

It may be the following reasons: 1, there is something wrong with your mobile phone! 2. Your mobile phone time setting is incorrect! Maybe someone is joking with you. It was a simulation at that time, but it was actually a short message! 4. There is something wrong with the mobile server! Generally, a short message is not received by the operator because it is not turned on, and it will be stored for 3 to 7 days at most, otherwise the server will automatically delete it, so there will be no short messages five years ago! You can do an experiment by yourself, send a text message for 7 days and then turn on your mobile phone to see if you can receive it.