While this may not be a breeze for an MVNO network like Straight Talk, you need to determine which type of phone you need to configure. Because Apple database is the one that determines which iPhone is being processed as locked or unlocked, it basically means that iPhone is recognized as unlocked from all mobile networks. I currently using Straight Talk, but with an ATT Iphone 4, and I know very little about Sprint Iphone 4, if you can show me in the right direction, please do it and thanks in advance. Verizon iPhone 4 does not have a SIM card slot so you can not do it that way, and with ST Take your own phone application, they explicitly say that the program is not working with iPhones. If the military personnel are to be placed abroad, they can easily distribute Sprint iPhone 5s to unlock that they have followed the unlock policy as follows. Benefits Of Unlocking Iphone 4s there. I think most people who use iPhone 4 and iPhone 4 with Sprint have already paid their contracts so it a little harder to find someone to talk about. I do not see any spaces that open to replace a Sims card. Do you have someone in Walmart who only has talc available to change it or is it not possible? I purchased a new unlocked Verizon phone that is compatible with all other service providers, but StraightTalk would not use a different SIM card than Verizon. Incorrect, illegal or unauthorized use of the Straight Talk product may result in immediate termination of service without notice or trial. It comes in a white box (in a gray envelope) with the phone, 30 pin, USB cable and 1V USB charger (exact type as you get from Apple).