Is there any similar app or service like Find My iPhone? I think it needs iCloud to be set up, and iCloud needs iOS 5. Problem is, I don't want to upgrade to iOS 5 as I'm happy enough with my stable 4.3. I thought Find My iPhone can be used on iOS 4.2 onwards but I can't seem to find further information on it. Is there any Find My iPhone or similar app for iOS4.3? Thanks.