[Sherms]

Can i upgrade to 3.0 and jailbreak my phone to use on t-mobile?

I have no idea how to jailbreak or anything but i am guessing there are walkthroughs on this site. I just need to know if i can use 3.0 on my 2G with t-mobile!

Sherms

[NeoNightmareX]

Yes a 2G iPhone is unlockable and jailbreakable on firmware 3.0. Just download redsn0w 0.8
Apple Forums & iPhone Forums, Mods, Hacks, News, Themes, Downloads, and more! | ModMyi.com - Downloads - redsn0w Windows 0.8
Apple Forums & iPhone Forums, Mods, Hacks, News, Themes, Downloads, and more! | ModMyi.com - Downloads - redsn0w Mac 0.8

And follow these guides:
iClarified - iPhone - How to Unlock/Jailbreak Your iPhone 2G on OS 3.0 Using RedSn0w (Windows)
iClarified - iPhone - How to Unlock/Jailbreak Your iPhone 2G on OS 3.0 Using RedSn0w (Mac)

[Sherms]

Worked perfectly. Now i just need to figure out where all the Theme packages from Cydia went. Cause they all disappeared lol!

[blkcadi]

Your question has been answered in the other thread you started.

[satch2501]

The next time you do an upgrade, go in cydia, install apt backup. Run the app and click "backup". Oonce done, close the app and plug your phone to your computer and open up itunes. Right-click on the phone icon (in itunes) and choose "backup". Once done, you can upgrade, jailbreak and activate and unlock, then sync it back with your itunes. Then, in cydia, install apt backup. Once done, run the app and click "restore". It may take up to 5 minutes (depending on the size of the backup) but 80% of your installed apps should be back on your home screen (cydia apps of course) as well as your winterboard themes.