I am a GoPhone user. My phone is Samsung Galaxy SII HD LTE (Unlocked, brought from Korea). I am using $25.00/mon 1GB data plan.
However, I am getting 2G(GSM), not 3G. My phone works well in Korea, it even gets LTE with no problem. but if i put at&t SIM into my phone in America, I get 2g, not 3g, even after checking my phone setting and setting it to be 3G. I am supposed to get 3G network. Please help me