Help: JB & Unlock 3gs (3.1) for T-mobile

[joysmahal]

I bought a used iPhone 3gs on Craigslist today, firmware 3.1, baseband 05.11.07, first 5 of serial #: 88932.

Can someone tell me how do I jailbreak and unlock my iPhone 3gs so that I do not have to USB Tether the phone if I reboot.

Can I use PwnageTool for the Mac to do this (even though my iPhone is 3.1)?

Please help, I'm completely lost. I haven't JB & Unlocked an iPhone since the 2G over a year ago.

Thanks!
Joy

[i.Annie]

The tethered jailbreak is unavoidable if your 3GS has the newest bootrom. Doesn't matter what method you use to jailbreak. Just to clear that up.

In any case, you can always test it out to see what bootrom you're on by jailbreaking with Blackra1n and unlocking with Blacksn0w. Basically if the iPhone was released in the first line of 3GS's you'll be fine, if it is a newer iPhone most likely it will have the newest bootrom.

You can Google for a guide on Blackra1n, it's pretty straightforward and easy to use.