What is causing the cellular connectivity problems on iPhone with iOS 17.6?

“What is causing the cellular connectivity problems on iPhone with iOS 17.6?: As with the almost 200 replies to connectivity issues with 17.6. I’ve been having issues for the past week with AT&T. 2 bars & no cellular. Today I left home and had ZERO cellular. Could not do anything online. No internet at all. I’ve been avoiding IOS 18 update but I guess Apple is forcing us to update by all the issues with 17…. Force it down your throat. I see when I went to post this there’s not even an option for IOS or cellular connection issues. Apple thinks it doesn’t exist “

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Troubleshooting iPhone Cellular:

Update the iPhone with a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip. If any updates are availabe, they will install, sure enough.

Visit these Links:

• Install a Carrier Update:

It might be prompting you for a carrier update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

• Calls: If you can't Make or Receive Calls on your iPhone - Apple Support

• Messages: If you can't Send or Receive Messages on your iPhone, iPad, or iPod touch - Apple Support

• Errors:  If you see a Cellular, Ultra Wideband, or Apple Pay Issue Message after an iOS Update or Restart - Apple Support

• "No Service": Is "No Service" shown on the top-left corner of your screen? If so, go here to fix this: If you See No Service or Searching on your iPhone or iPad - Apple Support

• "No SIM": If "No SIM" is shown on the top-left corner of your screen, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

Hello rick329,

I'm not using AT&T as a cellular provider, but tonight I updated my iPhone 13PM to latest IOS 18.4 and have no issues to report. When you are able to connect to internet via Wi-Fi I would update to the IOS18.4. Can't say if that will help with your Cellular issues with AT&T, but you will have the latest security updates on your iPhone. Just my 2 cents worth.