Cellular data issue

Is your iPhone 7 model the A1660? Or a different model? You can find it in Settings>About, tap on Model and it will change.

When you reset it, did you use a computer using iTunes or Finder to restore it to factory settings?

If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart - Apple Support (includes "Cellular Issue Detected")

If you see, "Cellular Issue Detected" you may need to restore your iPhone to factory settings using a computer (remember to make a backup of data, if needed). If that doesn't resolve the issue, you could call Apple Support. They can run a diagnostic for hardware issues remotely.:

Contact - How to Contact Us - Apple

How to back up your iPhone, iPad, and iPod touch - Apple Support

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Related articles:

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Tap on that model number, and it should change to the 5 character model #. The A1660 model of iPhone 7 had a hardware issue with the cellular antenna. If you try everything in If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support and it doesn't resolve it, then back it up, restore it to factory settings using a computer. If it still doesn't work, it's probably a hardware issue, which Apple Support over the phone could probably detect with remote diagnostics. Is the specific message, "Cellular Issue Detected"?

fiscalini1 wrote:

No I haven’t

Then do so cellular data is provided by your cellular data provider.

fiscalini1 wrote:

Hi I have a iPhone 7 , it gets a message saying cellular data issue I reset (hard) but it keeps coming back. Please help

Have you reached out to your cellular data provider?

What did your carrier say when you contacted them about this?