How to reset the APN settings to default on my Apple iPhone 7 Plus

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Incorrect Access Point Name (APN) settings can cause issues with data services and with picture and video messaging (MMS). To resolve issues, you can reset the APN settings on your Apple iPhone 7 Plus to the default settings that are programmed into your SIM card.
1. Touch Settings.
2. Touch Cellular.
3. Touch Cellular Data Options.
4. Touch Cellular Data Network.
5. Touch Reset Settings.
6. Touch Reset.
7. The APN settings have been reset to default.