I just bought an iPhone 4s and it is blocked on O2. Now, I have a Gevey SIM and all works just fine, except for the signal where I get only 2 dots. When I go to "cellular", in order to use the cellular data or the 3G, I need to activate the "roaming" toggle. If I activate it, cellular or 3G works fine. Will it charge on my phone bill? If I have roaming turned on? Even though I live in my country and I have 1 gig of free data. Thanks!