I'm currently using my Lumia 620 here in the US on Red Pocket Mobile, have been for about two months, bought my SIM card and my phone from gsmnation, and they arrived together ready to go, red pockets website of course will need the SIM card number when you set up your device, the configure section of their site also has everything you need to get the phone working properly on the network, max it'll take you to get everything set up from start to finish is 15-20 minutes. I've been using the 500mb plan ($50) but you can go above to 1gb for $55 and I believe 2gb for $60. I'm under manual updates and have had no trouble updating the plan (I've been on it for about 2 or 3 months). If you do go this route I recommend creating a contact by the name of "Data Check" or something similar, with the phone number *777*1# , calling this number returns a text telling you how much data you have left on your account (I have the contact pinned to my start screen as well).