How to tell if your iPhone 3GS has an older or newer bootrom [jailbreak tip]

[iMore.com]

Want to jailbreak and unlock but need to know how to tell what bootrom your iPhone 3GS is running? There are two numbers in your settings that will be a dead giveaway as to what bootrom your phone has. You'll need to know how to determine your bootrom in certain situations if you want to achieve a software unlock.

Full story from the iMore Blog...