how to unlock iphone 3?

I dont know anything about this at all! please be specific and explain.. I just want it to work on t-mobile. Im worried about jailbreaking because it seems complicated and like it might break the phone.

the phone has the latest software already. Is jailbreaking hard/risky? what is the best way to unlock it? and is it something i can do on my own? Im not technically challenged, but im also not an expert

please advise! any video tutorials would be appreciated. i see so many online but i dont know what is legit or what applies to my phone> 3g and latest software. Using windows vista

Jailbreaking is a process of removing the enforcements imposed on an Apple iOS so that third party applications can be installed to it. Jailbreaking an iPhone may void its warranty. It is not a must to jailbrake an iPhone to unlock it's network restriction.
Jailbreaking is not needed for legit and permanent unlocking methods. You can unlock an iPhone 3G safer and easier without jailbreaking using remote unlocking service. You can get the remote unlocking service for an iPhone 3G from Theunlockarena.com at affordable cost.
Here are the easy steps to unlock an iPhone 3G,
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 3G phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 3G to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 3G.
6. Disconnect your Apple iPhone 3G and reconnect it after 10 seconds.
7. Your Apple iPhone 3G is now unlocked.