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Apple iPhone 7 Plus
Troubleshooting
If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:
1 Activate MMS
Press Settings.
Press Messages.
Press the indicator next to "MMS Messaging" until the function is activated.
2 Return to the Home screen
Press the Home key to end the session and return to the Home screen.