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I have found some resources on how to downgrade my iPhone 3GS from 5.0.1 to 4.3.3. I have saved the required SHSH blobs so I am ready to proceed.

I have a question though - if I do downgrade, will I be able to keep my SMS messages?
Will I be able to restore a backup done on the iOS 5?

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Yes, without a doubt. Unlike with the new ability to update only changes to the OS with iOS 5 delta updates, downgrading your OS will require you to restore the phone. Which essentially reformats the drive.

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  • Sorry, I am not sure I clearly understood your answer. Will I lose my messages or be able to keep (restore) them?
    – Xavier
    Mar 14, 2012 at 5:39
  • @Xavier under normal circumstances restoring will copy your messages back to the phone but during a downgrade it's very possible that iOS 4 won't be able to restore an iOS 5 backup. May 30, 2012 at 23:43
  • I can confirm that, I have downgraded and couldn't restore the backup - so messages are lost. It may be possible to restore them manually by digging into the iPhone files/SQLite database but I haven't tried that.
    – Xavier
    May 31, 2012 at 0:47
  • Good call, good luck! May 31, 2012 at 1:21

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