How do I unlock my samsung sgh-t669 gravity touch to a t-mobile network?

Samsung sgh-t669 not released or unlocked to use t-mobile network for my t-mobile prepaid sim card. Phone screen says says phone freeze. sim unavailable. contact service provider. I need samsung factory unlock an release code to t-mobile network.

take to a
tmobile store and they will unlock it for you

Hai, you can unlock your samsung gravity sgh-t669 easily by using unlock codes. You can get unlock codes from your current network provider or any unlocking sites. I unlocked my samsung gravity mobile by using unlock code. I got unlock code from http://www.theunlockspot.com/unlock-your-phone/rs10wp2/ . They need my imei number and current network provider details . They send me a unlock through email . I got fast and trusted service here..