Unlock AT&T Samsung S3

[amjath]

Hi guys,

My friend bought Samsung Galaxy S3 SGH-i747 from US.
Samsung Galaxy S III I747 - Full phone specifications

He wants to unlock it to use in India. Can somebody help how to do it

 

[funskar]

check this - S3 Unlocking

 

[amjath]

$169.99 anything lesser