iPad is not sending or receiving messages from non apple products
How do I reset my ipad to talk with my google using family via text
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Do you have an iPhone? Natively, the iPad cannot send/receive SMS messages. You need an iPhone, signed into the same Apple ID as your iPad, and configured for Text Message Forwarding. See this, How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac - Apple Support