The mobile phone inexplicably receives short messages in English and numbers. What happened?

This mobile phone is automatically connected to the Internet and something puzzling. What's so puzzling about receiving a text message?

Look at the number that sent the message. I don't know, just delete it.

There are two possibilities, one is spam, so ignore it, and the other is a piece of code. At that time, Nokia's mobile phone may crash because it accepts a piece of code.

If your mobile phone doesn't respond, you can delete it as spam.