Hi, I bought a Galaxy S2 i9100 international unlocked, in short, it supports: General 2G Network GSM 850 / 900 / 1800 / 1900 3G Network HSDPA 850 / 900 / 1900 / 2100 But when I took out my sim card from my Incredible S and stuck it into the S2, it recognized the phone number and carrier, but whenever I would make calls it says mobile data not in service. I then called VM and they said it wasn't compatible. I then asked them what were the requirements for phones to work, and they say HSPA 850/1900 and WCDMA. My phone has HSPA but I'm not sure about WCDMA, below is the link to the phone http://www.**********.com/item/Samsung-3G-Android-phone-i9100-galaxy-s-2/513431124.html I posted this at Howard forums as well and they were telling me to put a bell sim card into my phone and see if it works even if it does that forces virgin mobile to work with my phone?