Texting non iPhone user
Unable to send a text from IPad Air 4th generation. Software version 15.1
iPad Air 2, iPadOS 14
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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.