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Helpful answers
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Dec 29, 2015 11:35 AM in response to Abby0121by razmee209,Use Messages with your iPhone, iPad, or iPod touch - Apple Support
To use SMS/MMS, you need a text-messaging plan. Contact your carrier for more information.
If Wi-Fi is unavailable, iMessages will be sent over cellular data. Carrier cellular data fees might apply.
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Dec 29, 2015 11:36 AM in response to Abby0121by dalton673538,Do you have Cellular Data enabled? You can check this by going to Settings>Cellular and make sure that the switch for Cellular Data is green. After that is enabled turn iMessage back on again and then make sure it says that it was activated and not "waiting for activation"