I have the iPhone 7 and it doesn't let me send or receive texts if I'm not connected to the internet or have 3G/4g on? - 1

How do I stop it? I don't have internet so I'm unable to send and receive texts.

Read more: I have the iPhone 7 and it doesn't let me send or receive texts if I'm not connected to the internet or have 3G/4g on? - 1