I am looking at getting the Samsung Galaxy S4. I must purchase this device from another source because of the storage options. I have many apps that take up multiple GB's of space, so I am going to buy the phone in the 32 or 64 GB version. I read other forums and it says that the Galaxy S4 and one other phone need the "SIMGLW206R" Sprint SIM card. I am wondering if there is a reason for this because it is difficult to find a Galaxy S4, 32 or 64 GB, with a clean ESN (for the purposes of BYOD) AND have the right SIM card already in it. I would prefer not to buy the SIM card and the phone separate, and I would rather not downgrade my purchase to the S3. What can I do?