20 best mobile phones in the world today -Apple iPhone 4

5. Apple iPhone 4

The iPhone 4 is certainly the most impressive iPhone ever, and a big step up from the iPhone 3GS. The flat body is only 9.3mm thick - 24 per cent thinner than the iPhone 3GS at its thickest. It feels great in the hand, and at the keynote Steve Jobs remarked, "Its closest kin is a beautiful old Leica camera." By far the most in-your-face feature of the iPhone 4 is 960x640 Retina Display. It's got 326 pixels per inch, and we're talking tiny pixels, only 78 micrometers wide.The Retina Display, especially, is hands-down one of the clearest, most enjoyable screens we've seen on a handheld, and the sheer amount of technology packed into the device is surprising.The 3G reception disappearing problem is gone now with newer builds (although Apple would never admit to it being a problem) and while we know that many will never condone the phone not being at the top of the list, we still have a problem with the price.The iPhone 4 has finally started to slide in price - possibly in preparation for a new model - which makes it more of a decent proposition for new buyers. The screen technology is still among the best out there, and Apple is still bringing the latest updates to the iOS platform on the iPhone 4, helping it maintain its place in our top five by the skin of its teeth.

Quick verdict -If it wasn't for the reception issue, the iPhone 4 would have probably topped our charts long ago - and now dual-core phones have emerged with superior specs and design.It's still a class-leading bit of kit, and with the iPhone 5 supposedly delayed until September, it's still worth taking a look at - but Apple die-hards will want to wait to see if the new model is a better proposition or not.