If you are having an ATT iPhone and are looking to unlock it from the present network carrier you have two options. You can either request your carrier service to unlock the phone or lookout for the best third party experts who offer you the services at competitive rates.  The third party experts can unlock any type of iPhone models whether on contract or not giving you the freedom to choose your own network carrier services once the phone is unlocked. To unlock ATT iPhone you can check out with the unlocking shop who require the IMEI number of the mobile to send you across the unlock code. To find the IMEI 15 digit number on your mobile just press *#06# on the key pad or go to settings, general, about screen and find the number. As you forward the number to the unlock services they shall send you the permanent factory unlock code within 2 to 5 days’ time along with the instructions on how to use the code to unlock ATT iPhone.
 

The similar process is followed even to unlock iPhone 5s or to unlock Softbank iPhone. However, the iPhones contracted to any network services can also be unlocked using the latest version of iTunes. To unlock iPhone 5s you first need to install the latest version iTunes through internet connectivity. With a not accepted sim card you need to connect to the phone to iTunes and then wait till the iTunes detects the phone and then disconnect the iPhone and connect it after 10 seconds which shall be unlocked from any network carrier services. This is a permanent unlocking solution even if you are updating to new iOS versions. There is also no technical knowledge or skills required to unlock your phone following the instructions of the unlock shop.
 

It is also possible to unlock blackberry phone of any model by sending across the IMEI number to the third party phone unlocking services and get the code to free your mobile permanently from the present network carrier. There are many benefits associated with having the phone unlocked as you can now choose the network carrier services offering cheap rates in the market. You can also avoid roaming charges abroad by switching to the local network carrier services. Once unlocked it the phone shall not lock again enhancing its re-sale value in the market. The rates for unlocking the phones vary based on the model which are quite cheap compared to the benefits you can enjoy with an unlocked phone.