Cannot send SMS message Error 38

Pavestone2734

I cannot send SMS messages and the (default) Messages app says Error 38. What could be the issue. Reboot did not solve this problem.

de0u

Pavestone2734 Was it working previously? Are you aware of anything else changing at the same time, such as roaming?

de0u

Pavestone2734 "Error 38" appears to indicate a disagreement between the device and the carrier:

It may be useful to try suggestions found here: https://grapheneos.org/usage#carrier-functionality

Pavestone2734

de0u it was working before. No roaming.

Pavestone2734

de0u I tried all those. I will try talking to my provider.

Pavestone2734

Update:
My provider is Hungarian Telekom, talked to their agent, they checked and didn't find any issues on their end. They suggested I check which number is set as the SMS service number (should be +36309888000), but didn't find a setting that set's this either in the default SMS app (where it could be) or the settings.

So I downloaded the Google Messages app which includes a setting called SMSC. This included some random number and a question mark in the form of nnnnnnnn?n. I was told this is what we're looking for, and to replace it with the number above. However this setting does not stay and always resets after pressing OK and exiting. What could be the issue?

Pavestone2734

Is there a chance Carrier Config is outdated or inaccurate? There is only one carrier here which support Pixel devices officially and that's Yettel Hungary.