How to factory unlock an iPhone 5c to use any carrier?

How can you factory unlock an iPhone 5c for free with no surveys, or maybe with? No spams please. I need to unlock it before Sunday.

I suggest using UnlockediPhone.me, if you want to unlock your iPhone 4/4S/5/5S.
They unlocked my iPhone 5S for actually free within a day! I'm so happy and satisfied right now.

You can call your carrier and sometimes if you have a good history of paying bills/long term customers they will unlock no problem for free. If the carrier does not want to unlock the phone for you than you can go to a paid service such as cellunlocker.net (have not used this myself, but has tons of great reviews online) and they will unlock it for you within a few hours at most. The paid services usually cost around $40-$70

I think this will answer your question: