I'm wanting to buy an iPhone 6 or 5s from EB or CL for use abroad, and need help understanding the technical side of "Bad ESN". Is "Bad ESN" only where the ESN (or IMEI) is black-listed as stolen/lost/account not paid with the provider, or does it include something more? If so, does this mean that using the phone outside of the US would have no problem? Is there any difference between a "Bad ESN" Sprint iPhone, Verizon iPhone, or T-Mobile iPhone?? I live in the Middle East and will be only using this phone outside of the US, so I'm thinking this may be a ticket to a cheaper phone. (Also, I'm aware that the phone cannot be associated with an iCloud account.) Any advice appreciated. Any personal testimonies also appreciated!