> The one issue with T-Mobile is it uses the fairly nonstandard 1870 MHz frequency. I don't know of any other carrier that does (anywhere).
I think you mean GSM/UMTS band II (PCS), as 1870 is in the uplink portion of PCS (1850–1910MHz). That's a pretty standard frequency in North America. All four major US carriers (ATT, T-Mo, Verizon, and Sprint) operate in it (CDMA band class 1 overlaps with UMTS band II), as well as Bell and Telus in Canada, and Telcel in Mexico.
The only somewhat-oddball spectrum T-Mobile has is AWS, which they use for UMTS service. Even then, that's still a standard band according to the ITU.
I think you mean GSM/UMTS band II (PCS), as 1870 is in the uplink portion of PCS (1850–1910MHz). That's a pretty standard frequency in North America. All four major US carriers (ATT, T-Mo, Verizon, and Sprint) operate in it (CDMA band class 1 overlaps with UMTS band II), as well as Bell and Telus in Canada, and Telcel in Mexico.
The only somewhat-oddball spectrum T-Mobile has is AWS, which they use for UMTS service. Even then, that's still a standard band according to the ITU.