Q: 9.2.1 update text android

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Go to Settings > Messages. Check that the type of message that you're trying to send is turned on (iMessage, SMS, MMS, or Group messaging). Also try to restart your device, and check for a carrier settings update. If that doesn't resolve the issue, contact your carrier. This article should be helpful: If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support