Most Android phones from them are Sprint, but there's T-Mobile ones, and a phone with AT&T, and a phone with Verizon (no roaming on VZ). Then they have ST SIM, which you can choose T-Mobile or AT&T.
Well I been all over NJ and PA with my ST Iphone 3GS and no signal issues or roaming I even called over seas for 5 minutes each time and no warning or issues. Still I do wish ST had LTE .
Just don't go too far away from the city straight talk uses Sprint (no roaming)
Just don't go too far away from the city straight talk uses Sprint (no roaming)-Rob
STRAIGHT TALK 4 THE WIN!!!!! Sorry ATT but your "amazing pre paid deal" SUCK!!!