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Try a reboot, if that doesn't help, try a factory reset. But first Make sure you don't have the phone muted first. If all of these fail.... call for a replacement.
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I would do the reboot first, then if that doesn't fix it, I'd boot to Safe mode (power off, then power on and when you see the red circle M Motorola logo, press and hold both volume buttons until the home screen appears) to see if there's a user app interfering. If that doesn't work, then I'd go the factory reset path.
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I had this problem twice so far this year and both times this worked - dial *228 and choose 1 to activate your phone.