I call her now, but I can't get through now. What do you mean, the message I gave her is not in the service area?

1 There is no signal on the other party's mobile phone, so the dialed mobile phone can't receive the signal temporarily. At this time, this prompt tone will appear when dialing the other party's mobile phone system.

2 The other party has set the call forwarding, and the caller has set the call forwarding as an empty number. This prompt will appear at this time because the system can't search for effective information.

The other party took out the SIM card without turning it off. If the owner forcibly takes out the SIM card without turning off the phone, and the system can't search the owner information when calling the other party, this prompt tone will appear.

This prompt will also appear when the phone is set to airplane mode.

5 the other party set up a strange interception.