I often bring locked iPhone from some developed countries such as US, Japan, Korea to some developing countries such as China, Vietnam... There are great demand in these countries. There are 2 ways to unlock these iPhone:
1. Order service code to unlock: Take about 3-6 days. The price is from $30-$100 for iPhone 5/5s/5c/6/6+.
2. The simpler and cheaper way: Use unlock card (Heicard, please google for it). It takes about $10 and can unlock all iPhone of all version from all carriers.


I am discussing with the OP to take part in the project to make GSM coin to the moon!!!