Sorry, the subscriber you dialed is temporarily unavailable. Can you get the message?

When you unplug the battery of your mobile phone, call to say "Sorry, the subscriber you dialed can't be connected for the time being"

When the other party's signal is not good, when you call him, you will also be prompted "Sorry, the subscriber you dialed is temporarily unavailable"

If the other party's mobile phone is turned on, but the signal is not good during the call, the short message you sent can be received when the other party's signal is good.