The number you dialed has already started SMS calling service. Was it hacked?

When you are hacked, there are also response prompts such as "the other party's power is off", "the other party's power is off" and "the number you dialed does not exist", and you will also call the SMS service. So it's hard to say whether you've really been hacked.

I suggest you try changing your mobile phone number. If another number works, this mobile phone number becomes a short message calling service and will be hacked. The other party has opened the SMS calling service, so long as the owner's mobile phone is turned off or not in the service area, there will be such a prompt. 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.