How compatible frequencies/bands with Tmobile?

This may have been answered elsewhere, but I can't find it.

Just trying to understand something. I'm wondering if I can get a better signal with Tmobile if I use a phone that has a 1900 band on the 4G network. What I'm saying is, it looks like the Skyrocket doesn't support Band 2 for LTE on Tmobile's network. Is this correct? Does flashing your radio affect which bands you use for 3G vs 4G?

I'm supposedly "in the service area" for LTE on Tmobile, is why I ask, but I have never gotten a signal until I go closer to town. I'm within the edge of the "coverage" map. I realize those maps are optimistic. Have always used this phone here, but ATT works for people and the towers are in the same location as far as I know. Rural area.

Thanks for any help :fingers-crossed:

Skyrocket's bands are:
i727(r) freg's:
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 850 / 1900 / 2100
4G Network LTE 700 MHz Class 17 / 1700 / 2100

Tmobile uses:
LTE Frequencies:
1700 MHz & 2100 MHz AWS band 4
1900 MHz PCS band 2 (in refarmed areas)
Lower 700 MHz band 12 (in development) / in service in selected areas

3G/4G Frequencies (WCDMA):
1700 MHz & 2100 MHz AWS band 4
1900 MHz PCS band 2 (in refarmed areas)

2G Frequencies (GSM/GPRS/EDGE):
1900 MHz PCS band 2

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