Since iOS8, it is possible to use iPad or Mac computer to send and receive SMS text messages by going to settings - messages - text message forwarding - select device name - enter code.
https://www.helpsmartphone.com/en/apple-message-textmessagingfromipad
You will be then able to use the other device to send and receive text messages that are sent from or received on your Apple iPhone from your iPad mini, MacBook Pro, Mac mini, or iPad pro.