In areas with new coverage that it never had before counter check it with the voice coverage to makes sure it is actually there. What I learned a few mins ago is that it shows data coverage but it may not be there. That or the voice coverage map isn't being updated. For example look at Cameron, La, It shows 3G web in that area but the voice coverage says otherwise.
PCS HSPA in Las Vegas
* Coverage will expand to 100 million LTE pops for the first half of 2013, with the second half of 2013 expanding to 200 million POPs covered. Release 10 LTE (2×10, 2×20) will be better performing than all other competitors. T-Mobile USA. “This year, we’re stepping on the gas again. We are making continued coverage improvements and launching an advanced LTE network