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why can't I send messages from my contacts on my iphone 7
1. The recipient's phone is turned off.
2. The recipient's cellular service has been disrupted.
3. The phone number you're trying to send a message to isn't associated with a mobile phone.
4. Your device isn't connected to the internet or your cellular service is spotty or nonexistent.
5. Other
Try Reset Network Settings
Reset Network Settings Settings>General>Reset>Tap Reset Network Settings. You may need to enter your wifi passcode back in afterwards.