HT201415: If you can't connect to a cellular network or cellular data
Learn about If you can't connect to a cellular network or cellular data
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Helpful answers
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Jul 30, 2015 1:37 AM in response to deepakshilpiby D.Cohen,Turn on cellular data in the Settings app.
If this doesn't help, contact your carrier and ask for help. You can also restart/reset your iPhone.
- Press and hold the Sleep/Wake button
- Press and hold on the Home button
- Keep holding both buttons until the display turns off and back on with Apple logo on it.
Alternatively, you may go to Settings - General - Reset - Reset All Settings
https://support.apple.com/en-us/HT201559
If this does not help, restore your device to factory settings. Note that this will erase the data from your device.
Take a look this Apple Support article: Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.