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I am having the same issue. The phone worked flawlessly for a few weeks then a week and a half ago it stopped connecting to Tmobile data. Sometimes it will connect to 5G but that is it it will not connect to 4g or less. It is very frustrating. I took it into t-mobile and they couldn't fix it and they told me it is a Hardware issue with my S22 Ultra. They said I should request a new device.
I don't have any idea what is going on exactly, but it must be a network issue? My wife and I have Samsung Galaxy S9+ phones for 3 years and they are doing the same thing. Mine will not make or receive calls. We got hers to call in and out but with no mobile data. My phone would not receive text messages bit everything else worked. The reason I came on here was to find some info about the S22 Ultra that I was about to buy. But only because ours have this issue. So buying 2 new phones may have the same issue. This must be network issues? PS they were on ATT but I switched to Straight Talk at the end of the contract.
I understand how frustrating this is. Here are some troubleshooting steps you can try to get the phone working again for those calls. https://www.samsung.com/us/support/troubleshooting/TSG01001613/
For concerns with text messaging, you can try these steps: https://www.samsung.com/us/support/troubleshooting/TSG01001439/.
If the troubleshooting is not helpful, you will need to follow up with your service provider for additional troubleshooting steps, as they are responsible for these services.
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