So many network carriers of the world love to offer all of famous smartphones with their own support that gives them decent profit, it does not really mean that we cannot have an unlocked phone in which we can put up SIM card of any carrier.
In fact mobile carriers offer smartphones usually at low rates or at discounted price but later a customer might get irritated due to some reasons. Mostly I noticed that carrier locked smartphones are popular in USA, however almost all of popular phones seems to be locked in various conditions such as contract phones and national restrictions, mostly whenever you get discount on a phone or pay subsidy to buy a high-end smartphone, you will have to face many restrictions, that kind of deals get you locked into some terms like a long-term wireless communication contract for a minimum of a year.
Carrier locked smartphones contains specific software that prevents you to utilize any unintended cellular network. Here unlocking come into life to get rid of that restrictions as it is the current way of controversy, buy a Verizon phone that does not run AT&T SIM card and then unlock it to make use of any SIM card, it is possible using various unlocking providers, like SafeUnlockCode to get your device sim free. If you are decided to get a code, you can check here all handsets they unlock.
Sometime you import a carrier locked phone that does not run SIM card of your country will need to be unlocked through any third party. All in all there are many causes to unlock a smartphone but it’s worthy to remember that unlocking a handset may require an agreement between you and them. This is because nobody wants to face the blame of criminal or other penalties, so you need to agree with terms and conditions.
If you are in USA, you need to bear in mind that unlocking of a carrier locked phone is illegal, your phone may not be unlocked without the expressed permission manufacturer or carrier or both. So take a step an ahead at your own risk.