Hey there, I am buying an iPhone 3GS, is it safe to buy. Should I avoid any models/basebands/firmwares/etc? Thanks!

(someone move this to the 3GS category)

1. The baseband MUST be 04.26.08. Anything higher than that will NOT be unlockable at this time.
2. Avoid iPhone with firmware 3.1. Stick to 3.0 at the moment. You cannot jailbreak 3.1 at this time.
3. T-Mobile's 3G will NOT work on the iPhone 3GS because of frequency differences. You will need to turn off 3G mode in order to use T-Mobile service.
4. Based on 3, you can only use EDGE on the 3GS.

__________________
iPhone 2G T-Mobile USA
17 November 2007
1.1.1-->3.0 (jailbreakme.com, anySIM, iJailbreak, ZiPhone, PwnageTool, QuickPwn)

iPhone 3G AT&T/China Mobile
5 January 2008
2.2-->3.1 (yellow/red/ultrasn0w, PwnageTool, QuickPwn)

I can try to answer your iPhone related questions! follow me at @acwan on twitter!