Apps not working with cellular data

Do you by chance use a VPN on your phone? If you do at a minimum turn it off, but better yet, remove the VPN profile from your phone. VPNs are known to cause connection issues on iPhone and completely not needed on iPhone.

Tabbyk1215 wrote:

Im at a complete loss and don’t know what to do anymore. My apps will not work will cellular data ever since I have updated to the latest version. I have spoken with T mobile in which did a 5 day investigation with engineering finding no issue, bought a brand new phone and spoke to the supervisor of apple care which they all have basically done everything but completely wipe my phone clean. I don’t know if it’s a virus that transferred over from my old phone or what. But I had an iPhone 12 Pro, updated the phone to IOS 18.1.1, it stopped letting me use apps with cellular, bought a brand new iPhone 15, transferred over my iCloud information and it did the same thing the moment I was able to use the new phone. I don’t know what to do anymore. Someone please help. All AppleCare can tell me is to by a new phone and I already did that! And it happen on the brand new on too!

Well if you wipe your phone factory settings without using your backup and still have issue then you'll need to escalate the issue with T mobile.