What does it mean to ask users to open SMS calling service? Did he hack you?

SMS calling service is a service (name) provided by mobile company, and the cost is 1 yuan/month.

When the other party shuts down and can't get through, you will tell the other party to start the SMS calling service. When he opens his mobile phone, he will receive your call record: XXXXXXXXXXX users call you at XXXXXXXXX time, please reply in time.

Generally, people who don't turn off their phones can't use this function.

Of course, if you are hacked, there will be response prompts such as "the other party has turned off", "the other party has turned off" and "the number you dialed does not exist" when you call, and you will also call the SMS service. So it's hard to say whether you've really been hacked.