As long as your phone is SIM unlocked, then yes it should work.
I'd be interested to find out, if a friendly US user could devote a little time to test it.
My motivation for making this patch was for people like me who've imported unlocked Droid3's from the US to other territories. It hadn't occurred to me that there are US GSM carriers too, which would make the patch useful to a much wider audience.
If you don't know us frequencies are
1700 MHz/2100 MHz
, 850 MHz T-Mobile USA,
1900 MHz ]