Compare all Apple iPhone 4S 16GB black pay as you go deals

The iPhone 4S needs little introduction. It's one of the UK's most popular phones, and with over 500,000 apps for download, thereÆs almost no limit to what the iPhone 4S can do. It has a fast dual core processor, a superb 8 megapixel camera with 1080p video record, impressive Siri advanced speech recognition and the iOS 5 operating system. The iSight 8 megapixel camera can take exceptionally good photos, noticably better than previous iPhones. It can also record HD video at full 1080p resolution, with video stabilisation.

The Siri voice controlled assistant lets you use your voice to send messages, schedule meetings, place phone calls and much more. Siri understands what you say, knows what you mean, and even talks back. For example you could say something like æTell my wife IÆm running lateÆ, æRemind me to call the vetÆ, or æWhat's the weather like for tomorrow?Æ And Siri will answer.

The iOS 5 operating system introduced over 200 new features over the previous version. The New Notification Centre shows missed calls, messages, calendar invitations, friend requests and more. The camera app can now be accessed quickly from the lock screen, it has grid lines, pinch–to–zoom and touch focus. Photos can be edited from the photo viewer, with crop, rotate, enhance and red eye removal. Other highlights to iOS 5 include iCloud, Twitter integration, iMessage and Reminders.

Finally, iPhone 4S has an improved battery life over the iPhone 4 with 8 hours 3G talk time, 14 hours 2G, 9 hours Wi–Fi web browsing, 6 hours 3G browsing, 10 hours video or 40 hours of music playback.