Someone gave me a t-mobile phone locked with no codes and I have an att phone how...

hi it will be helpful for me to guide you the exact place if you had specified the model of your mobile .however codes are the best solution to unlock your phone from the t-mobile network .to purchase codes visit unlock-free here they ask the imei number of your mobile .finally they generate codes to unlock your mobile at free of codes .once your mobile is unlocked then it will be free to all network sim.