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The size of your phone's processor affects how fast you can do things on it. For example, you'll be able to have more apps running at the same time on a phone with a 900MHz processor than with 500MHz.

Mobile phones are built with different screen technologies. Generally, the higher the pixels per inch (ppi) number, the clearer the screen will be.

Screen sizes are measured diagonally. The bigger the screen, the better the viewing will be when you're browsing the web or watching videos.

With some phones, you need a memory card to use certain apps. We sell a wide range of them, from 2 GB to 16 GB.

You can make calls, send texts and browse the internet on a 2G network. If you're looking for faster web browsing, you might want to look at 3G-enabled phones.

This is where in the world your phone can be used. Some phones can be used worldwide, while others are restricted to the UK or Europe.

If your phone's Wi-Fi enabled, you can connect wirelessly to the internet when you're in a Wi-Fi hotspot (including airports, restaurants and train stations).

GPS allows you to pin-point your location using satellites. So you can use SatNav applications on your phone, or even find somewhere to eat when you're out and about.

Generally, the more megapixels your phone's camera has, the sharper the image will be.

Front-facing cameras are great for video calling (if your phone has the functionality), or seeing what you and your friends look like before you take a picture.

With auto-focus, you can click or tap to take a photo and your phone's camera will automatically focus on the subject.

Take photos quickly on the go - just press the dedicated button like you would on a normal camera.

Listen to your favourite tracks on the go. You could even download tracks or transfer them from your PC or Mac.

BlackBerry Messenger (or BBM) is an instant messaging service for BlackBerry users. It lets you send real-time messages, share pictures and even show your friends what you're listening to.

Make a phone call without having to search through your phonebook. Voice-activated dialling means you can simply say the name of the person you want to call and the phone will dial their number automatically (you'll need to set this up first).

There are different types of email you can get on your phone. You can keep up-to-date with accounts like Gmail, Hotmail and Yahoo! - and with push email, you'll get your messages straight away.