AirPortal.de is the best online tool that reports sightings of upgraded Tmobile (1900) markets.
So, you have successfully unlocked your iPhone and you are trying to use Tmobile as your carrier…
BUT, the iPhone is displaying NO SERVICE….
There is a good chance that you are not in an updated Tmobile market.
For the iPhone to work on Tmobile it must use the 1900MHz or PCS/UMTS band II.
Please check with your local Tmobile store to make sure you are in an upgraded market.
You can search for you zip code with this handy tool:
Again, the sure-fire way to tell if your phone should work in your area is to visit your
local Tmobile store!!!