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.
- Open up Settings
- Tap on General
- Go to About
- If you scroll down a bit you'll see your serial number and your model number.



You can use one of these two numbers to determine if you have an older or newer bootrom.
Model number method
The easiest of the two is the model number. If your model number begins with MC, you have a newer bootrom. As you can see above, my serial starts with an MB. I have an older bootrom.
Serial number method
Another way you can check is by looking at the 4th and 5th digits of your serial number. If it is lower than around week 35, your bootrom is older. I'd say the model number method is the most efficient but you can use both to determine your bootrom version.
If you have other jailbreak questions or run into issues, check out our jailbreak and unlock forums as well!
Daily Tips range from beginner-level 101 to advanced-level ninjary. If you already know this tip, keep the link handy as a quick way to help a friend. If you have a tip of your own you’d like to suggest, add them to the comments or send them in to dailytips@tipb.com. (If it’s especially awesome and previously unknown to us, we’ll even give ya a reward…)

Apple gives 'Prehistoric Planet' a big apple.com promo on premiere day
Apple is making sure everyone knows about the new Apple TV+ series 'Prehistoric Planet' by slapping a massive animated promo on its apple.com homepage.

Phenomenal iOS 16 concept has all of the features you've been dreaming of
With Apple keeping its iOS 16 plans close to its chest, we already know that we'll be very happy indeed if it turns out to be anything like this new concept.

Review: SANDMARC's Macro Lens easily beats the native iPhone macro mode
While the iPhone 13 Pro is capable of Macro mode photography, it is far from perfect. With SANDMARC's 25mm Macro Lens, you can get even better macro photos with your iPhone 13 Pro, or even with older iPhones.

Even the iPhone 13 Pro Max can be cute with the right case
You've got Apple's flagship iPhone and boy, is it gorgeous with that huge screen. You can make it cute all over with one of these cases.