Hello all, I have a pretty basic question that I'm hoping I can get an answer to. I have a recently rooted and unlocked at&t S2 and I'm wanting to get a cheaper option as far as my monthly bill is concerned. As my phone is unlocked can I get a cheap phone from either Virgin ($35 per month) or Tmobile ($30 per month) and then activate the new SIM in my S2 and use that on the new plan? I'm hoping so. Thanks!