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3G Unrestrictor 5 works on all versions of iOS 5, including the latest iOS 5.1 version. It tweaks applications to allow normally disallowed 3G services to run when there is no Wi-Fi connection available. This means you can video call your friends without using Wi-Fi, or backup your device with iCloud, as it bypasses the need to be connected to a high-speed broadband network.
But be careful. There is a reason why Apple restricts these settings -- so that iPhone users do not churn up their data tariffs by using FaceTime or Skype video.
Price: $3.99 (or $1.99 upgrade.)
Compatible with: iOS 5+ (including 5.1.)