There are hundreds of network operators around the globe that lock their phones onto their networks. So we un-lock the SIM locks from the phone so that you can use any network you please.
Unlocking your phone will give you freedom to purchase or use a SIM card from another network in your own country or even worldwide. Unlocking your phone will give you the opportunity to change the SIM card to a local provider when abroad, allowing much cheaper calls. It will also increase the value of your phone if you sell it.