The mobile phone received a text message saying that it was a value-added service fee.

Value-added services include CRBT, caller ID, GPRS traffic fee and MMS fee. Your weather forecast is also included. But you said you didn't use these.

There are also many expensive businesses. For example, some so-called quiz, brain teaser, riddle answering and other interactive games. It also includes some voice songs (sending songs to friends and relatives) and voice chat. Voice greeting cards, voice magazines, etc. Will you reply to any service information sent to you by others, or will you hang up after a few seconds, and then you will be cheated, and you will find that you have deducted a lot of money?

Value-added services include WAP services, that is, Internet services, including ringtones, game downloads, picture and video downloads. These are very expensive. Generally, the charging method of information fee is: call fee * yuan/minute, and monthly fee * yuan/month.

What I said, you check, if you accidentally booked such a business, or downloaded something online.