Nexus 4 vs iPhone 5 vs S3 vs Lumia 920 vs BB Z10 head-to-head review

Although the Samsung Galaxy S4 is about to be announced to the world, there are still plenty of high-end devices on offer if you're about to upgrade. In fact, with the S4 set to land with a premium price tag, considering one of these devices might be a good way to bag yourself a bargain.

We've picked the best Android, BlackBerry, iOS and Windows Phone on offer andcut through all the marketing jargon to analyse the key areas and help you to find the device that is best suited to your needs.

In this group test we are going to cover the key features of the handsets - display, internet performance, battery life, camera, and pricing. We'll also take a look at the features which are unique to each one.

Does a quad-core handset really deliver better performance? Which device has the best display and battery life? Which handset is best for viewing documents and browsing the web? All these and more will be answered.

We will start by looking at The Contenders.