I work offshore and recently added a T-Mobile pre-paid plan because of several of my crew members still had full service with them out there (call, text and data). I use Straight Talk on land and works great, but cuts out a few miles offshore so I started using T-Mobile once it cuts out (Samsung A30s dual-sim). It works great until I am right at our work area and swaps to roam on Tampnet (call and text only, no data). I have several co-workers that have full service while operating on the Tampnet network and even says on their website that T-Mobile is one of their carrier partners. T-Mobile has also teamed up with Rignet recently, who also covers a broad area of the GoM. My co-workers have the same plan as I d. Some of them bought their phones through T-Mobile and some have purchased the sim as I did. I have called customer support 5 times already with no avail. I have tried changing setting to my APN and still have the same issues. Any ideas?