This method had its advantages, as it allows you to buy a decent phone for cheap or sometimes free, but the main drawback was that it locked customers to a network and phone usually for as long as two years. And worst of all, some are just simple scams. To ensure that you find the right provider, we have reviewed and tested the various providers that are available. About the iPhone Upgrade Program In a significant change, Apple has begun to offer the iPhone Upgrade Program. It easy for its American customers to save the cost of a new iPhone with interest-free installment plans and the ability to upgrade their iPhone every year to update the latest model, distribute it. Unlock S3 Phone more. However, they are officially blocked by hauliers and specified in the Apple Unlock database, allowing the iPhone to be freely operated from anywhere with any operator. Therefore, I writing a guide to unlocking an iPhone 6 or 6 Plus so you understand exactly what to do to unlock iPhone.