How to unlock my Iphone 4 for free?

It is an old AT&T phone and it was given to me by a good friend but I don't have the money to spend to unlock it help please

Added (1). I'm flashing it to metro pcs and yes it can be done they already ordered my sim card thanks

The only way you'll get it for truly free you'll have to have AT&T unlock it. If that's not an option you an get it unlocked for $10 here: http://gsmunlocklabs.com/unlock-iphone/

they even have a "free" option where you sign up for some offer like netflix and you get the unlock for free.

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