There is an executive order protecting your naturally given rights. A corporation cannot force you to be vaccinated in Texas. Thank goodness for sane leadership on this issue.
Texas Workforce Commission. Contact them now. Tell them what TMobile is doing -- forcing you to get the vaccine and disallowing (or making difficult) exemptions.
Enough people call, TWC will levy fines. The fines are per employee. Perhaps TMobile is willing to pay the fines though, I will say that. But still, call TWC.
Here's the TWC order, based on the governor's Executive Order.
https://www.twc.texas.gov/files/businesses/commissioner-letter-covid19-vac-mandate-120821-twc.pdf&ved=2ahUKEwj8iYL2qtv1AhXrlYkEHS0_CWkQFnoECAcQAQ&usg=AOvVaw1oMAw6-Ue9xC6awEzCysUV