Please pardon in case this is a re-post.
I recently moved from AT&T to T-Mobile and am still using my unlocked HTC One M7. I get decent coverage in almost all the places except at my desk at work. My colleague who also has T-Mobile gets 2 bars at my location with his Samsung S4 which he bought from T-Mobile.
My question to the tech guru's is if it would help, if I flashed a custom T-Mobile rom (ViperOne) on my phone would it reprogram the radio on my phone to use the T-Mobile frequencies? Or would it make more sense to just flash the T-Mobile Radio on my phone to resolve the reception issue?