"The phone you dialed has been opened for full-time service, and we will inform the other party of your caller ID by SMS", was it hacked by the other party?

1. It's not hacked by the other party. In this case, the other party started the full-time communication service: the full-time communication service means that the user transfers the incoming call to the mobile full-time communication platform in order not to lose the telephone information dialed during this time when the mobile phone is turned off or out of service area, and sends the missed call information to the user terminal in the form of SMS when the mobile phone is turned on or the mobile phone returns to normal.

2. If it is blacked out by the other party, it will remind the other party that it has been turned off, or it does not exist. If the other party blackmails you, even if the other party has opened full-time service, it will only remind you that your phone is turned off or the number is empty, and it is impossible to have a full-time service prompt. According to this situation, the other party is really unable to answer your call at present. It may have shut down or stopped service.