How come two Apple phones can't get information without surfing the Internet?

The short message sent has become imessage.

Generally speaking, you can still receive information without the network, unless there is only one case where someone sends you a text message on an Apple phone and it is automatically converted into imessage, and you need to receive it through the network. At this time, your cellular network is not turned on, and there is no wifi, that is, there is no network, so you can't receive imessage.

Imessage is a communication software developed by Apple. It is not just a simple SMS function, but a tool that can send text, pictures and videos to ios devices or mac devices through the network.