What is the safest way to unlock an iphone 3gs?

My friend is giving me their old iphone 3gs but I use T-Mobile. What is the easiest, and safest way to make it usable? Details would be helpful, first timer here.

The safest way is to get an official carrier authorized unlock that retains a full functionality of the phone but it's possible only with some providers. You can check the list and the service here: http://www.fastgsm.com/en/apple/apple/apple-iphone-3gs/unlock

The safest and easiest way to unlock an iPhone is to unlock using remote unlocking method. It is also an affordable method too. You can get the remote unlocking from http://www.simpleunlocking.com/ this is a trustworthy source providing accurate unlocking solutions at affordable cost with easy unlocking instruction guide. All the best mate.

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