How to unlock a samsung a737 phone for free?

I have a samsung a737 from my friend and it is phone freeze. And also how do I unlock the samsung a737 without the computer. Oh yea I have t moble sim and the a737 is att.Can i do it for free?How to unlock a samsung a737 phone for free?All SIM unlock codes are tied to the particular device IMEI and are carrier specific. The request for that code would need to be made from the carrier that the phone was originally manufactured for (in your case call AT%26amp;T at 1-800-331-0500). Each carrier has their own guidelines as far as what requirements have to be met before that code will be given out. This is a free process in the US.How to unlock a samsung a737 phone for free?if network unlock is what you are alluding to , then unlock codes are the best method to unlock your phone, try codes from http://www.theunlockspot.com/