iPhone unlock questions

What is the Factory Unlock for iPhone?
Is Factory Unlock Really Permanent?
How can I Trust IMEIUnlockPro?
How to Pay IMEIUnlockPro?
How do I Receive a Refund? What is the Policy?
Why are iPhones Locked to Carrier SIM?
What iPhones can be Unlocked by IMEIUnlockPro?
Do I have to Send iPhone for Unlocking?
What is a Jailbreak and is it Related to Unlocking?
How to Unlock / Activate iPhone?