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I have a jailbroken (not unlocked) iPhone 3G running the 3.1.2 firmware. What are the pros and cons of upgrading this to iOS4?

Being jailbroken, I already have multitasking and home-screen wallpapers. What does the new iOS give me that I don't already have access to?

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I've done it and it's not worth the trouble. I'm considering rolling back to 3.1.2.

The beneficial changes are minimal (and most can be provided by a jailbreak app), and the performance decrease is very noticeable. I've found that crashes are much more frequent as well.

My advice: Don't do it.

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3.2 is iPad only. 3.1.3 is the previous iPhone version :-) – Thomas Jul 15 '10 at 18:37
Ahh, I think I meant 3.1.2 (changed) – Damovisa Jul 15 '10 at 21:53
+1. I upgraded to 4.0 and experienced how painfully slow it was. I've downgraded again and I'm happy. I have no need at all for the new features -- folders, single mailbox, etc. -- that's all just bloat to me. I'm sure v4.x is great on faster devices though. – Torben Gundtofte-Bruun Aug 7 '10 at 10:04

In my personal experience, iOS 4 was only marginally slower than iPhone OS 3, so it really comes down to features.

First, iOS 4 does not allow you to put home screen wallpapers on an iPhone 3G. I don't have experience with multitasking on a jailbroken device, but again iOS does not provide this functionality on the iPhone 3G. However, given the memory and processor of the iPhone 3G, you really wouldn't want to multitask on the device.

In terms of features that iOS 4 does offer the iPhone 3G, here are some top ones:

  1. Mail - unified inbox, multiple Exchange accounts, message threading
  2. Folders - a very useful way to store similar apps to save space
  3. iBooks - eBook and PDF reader (useful, though this app was somewhat slow on my 3G)

It's also worth noting that there are already apps that require iOS 4 and the number's only going to grow. Not having iOS 4 will reduce the number of apps that will run on your device.

Since I never really got a lot of utility from jailbreaking, it made the decision to upgrade pretty easy for me. However, if having a wallpaper or running apps from Cydia is important to you, you're not really missing out on a whole lot, at least for now.

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You'll also have direct transfer of files from iTunes to the applications that have enabled it, and the choice of open files with certain applications. I personally find the update very convenient because of the many small improvements, specially now that I have solved the speed issues I initially had. – Pablo Rodriguez Jul 16 '10 at 6:56

Most of what I've heard is that it's not worth running on the 3G as it's very sluggish.

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Resetting to factory defaults and reconfiguring has solved the issue for me. – Pablo Rodriguez Jul 16 '10 at 7:13

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