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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.)
Spire is a non-iPhone 4S working port of Siri. It's an easy port over, and doesn't churn up half as much space as you would think. On older devices, particularly iPod touch devices, it may run a little slow, and it all depends on a working proxy. But once you find one -- and be warned, you may want to pay for one, as they are readily available to purchase on the web as a premium service -- you will have a working version of Siri. Just hold down the home button and you are set to go.
International Business Times has a guide to install Spire on your iOS 5+ device.
But be careful. Your data may run through this proxy, so emails and other data may not be as secure as you would ordinarily like it.
Compatible with: iOS 5+ (including the iPod touch, iPad, and the iPhone 4 and 4S)
IntelliScreenX is my favourite jailbreak application for the iPhone. In iOS 5, the notification center was brought to our screens. But it could do so much more, and do a lot better. It lets you see everything you have coming in from your lock screen -- all at a glance.
The notification center is replaced by this app, but adds so much more. It adds emails, Facebook, Twitter, phone calls, instant messaging notifications, plus more. From the weather, to RSS feeds, and even stock quotes, you can customise it completely to get exactly what you want from your lock screen.
At $9.99, it is entirely worth it. It comes with a free trial so you can see exactly what you're getting.
Price: $9.99 (+ free trial.)
Compatible with: iOS 5, 5.0.1, and 5.1.