Back when I had Tmobile (2004) I never had any problems with coverage. This was in Fort Collins. I travelled up and down the front range without issues. There isn't tmobile signal at my current work place in Littleton, but there is just outside the building.
I'm sorry I don't live in those areas, but I actually have had better luck with my T-mobile coverage area here than I did with Verizon who I had for 8 years. You can always give it a try. They have a return policy I believe. I'm a happy customer. Good luck
When I went to Boulder and Denver, the coverage was on par with Cingular. I went to Lovelands last year, and the coverage was fairly good (about 2-4 bars around the area). I didnt have any complaints at all.
ive had nothing but good signal everywhere i go. when i travel to littleton, there were places where with verizon that i had no signal, but with tmobile i have full signal. just depends on where youre at i suppose, i have great reception all along the I-25 corridor.
T-Mobile gets a thumbs up all around Denver. Of course, not every carrier works 100%, but T-Mobile gets credit for growing faster than anyone here. They stay on top of new housing areas and recently have been adding more sites that are specifically designed to serve residential neighborhoods. They have a handful of very complicated applications that involve environmental impact studies. They are very determined. The result has been an almost daily improvement in service that has resulted in areas where coverage is even better than Verizon. I just ordered a 2nd T-mobile account.
If you look at compass.t-mobile.com, Tmobile is adding a number of sites in SW Metro. I think I counted 8. I hope they add one near my work soon.