cellular data not working for iphone 13 pro

I believe we are having the same issue. As of September 2021 I am active duty stationed in Guam. When i arrived to island my data worked fine as IT&E is supported over here. After going on a deployment I returned to the island where my data still worked fine for roughly 2 months even after going back stateside for the holidays. Around February there was an issue with cell service over here (believing that it was T Mobile I switched over to a local SIM card) I realized that there was a temporary problem with the IT&E provider so after my 1 month plan expired I decided to switch back to my T Mobile SIM card. My data worked for a few weeks and then suddenly stopped. I am able to text and call but have no data when off wifi. There seems to be no fix I could find so far even after talking with T Mobile.