Apple's mobile phone sent a text message indicating that it had been delivered, but the phone number was empty.

There are three main reasons, namely: 1, the other party's mobile phone has transferred the call and transferred the incoming call to an empty number. This is a network problem or the number stored in the phone book is incorrect. It is the other party's phone that blacklists the dialed number.

Empty numbers generally refer to numbers that have been closed, frozen, nonexistent and not opened.

Set the number on the mobile phone for call forwarding, and you can routinely apply business processes such as SMS, voice call and total traffic.