Recently, I often receive short messages with Internet password. What kind of scam is it?

1 Send you a text message to attract you to call back by various means, such as: you spent RMB XXXX on your mobile phone somewhere on a certain day and so on. If you call him back, he will say that it may be "wrong consumption record" and ask you to call their technical engineering department (give you a number). If you call this number, someone who calls himself an engineer will ask you to do what he says. ......