iPhone Firmware 3.1.3 Released – Breaks Jailbreak/Unlock for iPhone 3G/3GS
This cannot be stressed enough. Skip the latest Software Update 3.1.3 and have a nice time with your 3.1.2 iPhone 2G/3G/3GS! Apple supposedly fixed some bugs with 3.1.3 but as always they strive hard to break the jailbreak capability which in-turn breaks the unlocking capability.
iPhone Dev Team strongly suggests you tame your temptations to update your iPhones to 3.1.3! iPhone 4.0 is the way to go (we still have few months atleast though)..
Google on the other hand released the most wanted OTA update for the Nexus One today (coincidence?!). Google encourages the users to use their devices however they like and even provides a tool to unlock the full potential of the Nexus One unlike Apple!