I got a short message from an Internet phone for no reason.

Actually, there are three possibilities for this kind of thing. One is fraud, which makes you bite bit by bit and finally makes you lose. Second, it's a joke. Even people they don't know, some people will be idle and bored to do these things. Third, it's a wrong number. I won't explain this. The best way is to directly blacken. Be quiet! As for the phone number you said is empty, there are two possibilities. One is that he transferred the phone to an empty number, and the other is that he used a phone number, but not a GSM card, but a calling software. That kind of software can be downloaded from the Internet, making phone calls is free, and registering a number can call for ten minutes, half an hour, unlimited time and so on. It doesn't matter.