Are you among the people who have bought these phones of late? Then you must have noticed that you were advised to sign up with the Apples. This carrier is in US and you have to sign for AT and T so that your phone can be activated. For this reason your phone is only able to work with the AT and T networks with the use of their SIM card. The card is situated on a minute tray located between the phone’s button which is for sleep or wake and then dug in head phone jack.
It becomes a problem when you travel out of the country and maybe go to Europe. This means that the network you were using cannot be accessed in the country you travelled and this is a disadvantage for you. You find that the country you have travelled in has lower rates when it comes to the phone bill and would like to take advantage of the rates and call as many people as possible. So what do you do when you are in such a situation? Well you can only unlock the iphone. Unlocking it will allow it to use a card from any provider.