If these SoCs don't have modem variations, then the specs can look like this:

* GSM/GPRS/EDGE (850/900/1800/1900 MHz)
* 3G-HSPA+ (850/900/1900/2100 MHz)
* 4G-LTE (700/1700/2100 MHz)

However, I suspect they can have variations of the modem within the same SoC. Only newest Qualcomms support really the full spectrum of relevant frequencies. Older ones are segmented.

If the list above is OK, then it would work with T-Mobile, in areas where they bumped UMTS/HSPA+ to 1900 MHz, and will work with T-Mobile LTE when the OS will enable 4G.