The vast majority of iPhones purchased today are SIM locked, which means they will only work when used with a SIM card from one specific network. In every country that Apple offer the iPhone, they have signed agreements to supply locked handsets to the major cell phone networks. So if you were to purchase a cheap iPhone from AT&T you will not be able to use it on T-Mobile, Sprint or Verizon. So confident are the networks that they can recover this money, they will often supply handsets at massively discounted rates, on some occasions, even FREE, in return for a customer agreeing to a lengthy cellular contract. Providing their customers with a really cheap iPhone is a real no-brainer for the big service providers. They know that if they can get a customer to sign up to a 36 month contract in exchange for a cheap iPhone they will more than recover the subsidy offered over its duration.
Buying a carrier locked iPhone for half the price of a regular iPhone sounds like it's a great idea? What if you move to a foreign country and want to use a domestic carrier to save on excessive roaming charges? Everybody know that international roaming charges can bankrupt you! There have been reported cases where people have been on holiday and unwittingly using their iPhones on Facebook or Twitter only to return to an astronomical phone bill! The sensible thing to do is use a local carrier to provide your phone and internet service while you are overseas. But in order to do so you would have to unlock your iPhone.

unlock iphone
There used to be two different methods available to unlock an iPhone . The software method used to be the way to go, but this has subsequently been replaced with the IMEI unlocking process. Compared to the software method, an IMEI unlock enables you to permanently unlock your iPho