Find out what to do if you can't make or receive calls on your AT&T mobile phone.
iPhone 18 Pro Max update needed
Apple has released a software update to address an issue that may affect phone calls, data, texts, and 911 calls on some Apple iPhone 18 Pro Max phones. If you have an iPhone 18 Pro Max, update your phone to the latest available software (iOS 27.0.1). Go to Settings. Tap General, then Software Update.
Apple also issued a carrier settings update. It will roll out automatically in the coming days. To update your carrier settings immediately, go to Settings and tap General, then About. To confirm you have the latest carrier settings, on the About screen, scroll to the eSIM, primary or secondary section and look for Network AT&T. Carrier should read AT&T 72.1.
Together, these updates are meant to help prevent the issue from occurring.
If your iPhone 18 Pro Max is already without service, contact AT&T or Apple Support, or visit an AT&T or Apple Store. Affected devices can't be reactivated and will require a hardware replacement.
Apple also issued a carrier settings update. It will roll out automatically in the coming days. To update your carrier settings immediately, go to Settings and tap General, then About. To confirm you have the latest carrier settings, on the About screen, scroll to the eSIM, primary or secondary section and look for Network AT&T. Carrier should read AT&T 72.1.
Together, these updates are meant to help prevent the issue from occurring.
If your iPhone 18 Pro Max is already without service, contact AT&T or Apple Support, or visit an AT&T or Apple Store. Affected devices can't be reactivated and will require a hardware replacement.
FIX AN ISSUE
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Try these tips to get your phone working again
- Turn your phone off and back on.
- Try calling the number again.
- Make sure your device software is up to date.
- Confirm you have wireless service. Make sure you have a signal. Check our network coverage map.
- Turn off call forwarding. Press #21# on your phone and then the Call, Send, Talk, or Receiver key.
- Check that you aren’t blocking calls.
More troubleshooting tips
- Turn off airplane mode. Most phones show an airplane icon when airplane mode is on.
- Check your SIM card. You may have to take it out and put it back in if your phone displays Insert SIM or Emergency Call Only.
- Get device help
- Service suspended? Find out how to reactivate your wireless service.
- See a list of blocked calls and why they were blocked with AT&T ActiveArmor®. Learn more about AT&T ActiveArmor
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Last updated: October 3, 2026
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