Is it a good idea to to upgrade iphone 3GS to iOS 5?
Pros and cons
I don't think it's a good idea to do that.iOS 5 will work slowly on iPhone 3gs.
Well a 3GS won't receive iOS 6 or Siri ever, so pro's would be iMessage ( free texting other iPhones and iDevices), better Safari, iCloud, Folders, and Shared photostreams.
Also GameCenter and Newspapers, as well as the ability to run current apps built on iOS 5.1.1
Cons. You won't be able to return to your old iOS, but you won't miss it, as iOS 5 is an improvement for all iDevices.
I have iOS 6 on an iPod touch beta 3 ( yeah I know we're on beta 4 already shut it, I don't care) and it's awesomer with only 256 mb of ram. So you should upgrade.
Actually I believe you can go back to your old iOS by downloading an ispw from the internet and after doing a restore and activating your iphone, and setting it up as new on iTunes, and selecting check for update but holding the shift key and selecting the ispw file you downloaded from the internet. Then iTunes sets up the old iOS version back. I did this but to get to iOS 6 Beta 3 on my iPod and it works because the iOS is activated with apple after the restore and you're simply performing an upgrade) or in this case a downgrade after the restore.
The ISPW file is iOS ( put the version you downloaded here)
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