Best and latest way to unlock att iphone 3g to t-mobile?

I have this att iphone 3g that says 5.0.1 (9A405) carrier ATT 11.0

how would i go about making it so i can insert a sim and it will start working with t-mobile

i'm googling but its always outdated tutorials

How to Unlock iPhone 3G?

iPhone3G is among the latest and most versatile mobile phone devices in the market today. In case yours has been blocked and you are wondering on how to unblock iPhone3G, you can go about it through various ways. The best place where you are able to find the various ways on how to unblock iPhone 3G is from the internet. However, another easy way of going through it is to take the phone either back to the manufacturers since there are some who will unblock the iPhone 3G for you freely or at a certain fee.

.

Unlock & Jailbreak in
5 Minutes
Compatible With All iPhones 4s/4/3Gs/3G/2G
Completely Risk-Free & Very Easy To Use
100% Money-Back Guarantee

Unlock iPhone 3G
Unlock Now

This will help you
http://unlockappledevices.com

Get a factory unlock, its 100% safe (not like jailbreak) and its cheap. Go to iPhoneUnlockedCheap.com and get the unlock for $14.99 - 100% guaranteed

Jailbreak & Unlock it to use with T-Mobile Sim card or you can factory unlock it online.