Texting non iPhone user
Unable to send a text from IPad Air 4th generation. Software version 15.1
iPad Air 2, iPadOS 14
Question marked as
Do you also have an iPhone on your Apple ID? You need to use the iPhone as an intermediary from/to the iMessage texting system used by your iPad (but unavailable on non-Apple devices) to/from the SMS/MMS texting system. See How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac - Apple Support.