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https://en.wikipedia.org/wiki/Cellular_frequencies#United_States_Carrier_Frequency_Use
GSM @ 1900MHz should give you 2G on all carriers, except that Verizon and Sprint use CDMA (device-keyed) rather than SIM-based GSM.
UMTS @ 2100MHz only matches T-Mobile's AWS network.
Emyr
@hippy
From Mobile Phone thread...
Will a Sony K810i work in the US?
2G Network GSM 900 / 1800 / 1900
3G Network UMTS 2100
gsmarena.com/sony_ericsson_k810-1839.php