Hi, I am on T-mobile and trying to purchase an HTC One m8 which is rooted and locked to AT&T. Would it be possible to get the cellphone unlocked even though it is already rooted while on AT&T? I found a service on ebay which provides unlock codes for $3 but in their description it mentions that I should not try to purchase the code if my device is already rooted. I am a complete noob when it comes to android so please explain in detail. I searched around on google and in other threads but was unable to find a definitive answer to my question. Any help will be greatly appreciated. Thank you.