iPhone 5S T-Mobile power drain
Figured out why. Couldn't figure out how to share this in T-Mobile forum, so we go public.
1. Go to Settings, Carrier, Turn Off Automatic.
2. Set Carrier to Tmobile.
Someone inform the idjut that coded Automatic that constantly searching for a "known" carrier is silly. Was this feature an afterthought? Didn't you have time to think it out? Fix this ASAP.