Most camera types in mobile phones are measured in megapixels. 1 megapixel means 1 million pixels and 2 megapixels is equal to 2 million pixels. A VGA camera is equal to 0.3 megapixels. 1 megapixel or more is much larger than a phone's display so won't make a huge difference if pictures are only being used for phone applications such as MMS. However if you download images to a PC, or want to print them, then the higher the megapixel the better quality the picture.

A type of camera lens that can adjust the distance that is in focus (focul length). Auto-focus usually provides better photo quality than fixed focus since auto-focus lenses can be larger and allow more light to reach the camera sensor.

Wherever you are, whatever you're doing, share it with others in real time. Maybe you've made it to the front row at a concert or maybe you're out shopping and just need a second opinion. Video calling takes you wherever you want to go - it lets you see who you're talking to as if they're a few feet away.

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When downloading a video this means it will save to your mobile phone as opposed to video streaming where you watch the video as it plays (but it does not save on your mobile phone).

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Intergrated FM radio for listening to live-broadcast FM radio stations. Some phones with this feature require that a headset be connected to use the FM radio so that the headset can act as an antenna. Since this feature allows the phone to use FM radio directly using a separate antenna, it does not use the network and therefore does not cost anything to use.

Ringtones come pre-loaded on all new handsets the quality and range varies with each handset and manufacturer. Additional ringtones may be downloaded via your phone or the web or entered directly by a built-in composer. You can change your ringtone via the menus on your phone.

A wireless communication capability that works over a range of up to 10m. Bluetooth enables compatible devices including mobiles, PDA's and laptops to transfer data.

Wi-Fi is high-speed wireless access to the Internet. Wi-Fi is provided via hotspots that broadcast their signal over a range of 50 to 100 metres. You may have one in your home to provide access to your broadband line and you will find public hotspots in a variety of locations around the country. Some phones have Wi-Fi built in so that you can have wireless access to the Internet.

Global Positioning System. This is a satellite-based radio positioning system that can accurately identify very specific locations anywhere on earth. Add-on software and hardware can be purchased for some mobile phones to provide this capability. It is often used for route planning.

Software that allows audio streaming over Bluetooth. Devices with A2DP support wireless headphones and can send audio to Bluetooth speakers.

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Picture Messaging is also known as Media Messaging and Multi Media Messaging (MMS). It is the ability to send and receive messages including photos, text, sounds, and images from Media Messaging-capable mobile phones and the Internet to other Media Messaging-capable mobile phones and e-mail accounts. Messages sent to recipients using mobiles that are not Media Messaging-enabled will result in a text message being sent inviting them to access the message via the O2 website.

RSS allows you to receive free updates by subscribing (or clicking on buttons labeled RSS or 'XML') to information from sites that publish content (e.g. news outlets or bloggers). Publishers of information may make information available to users in this format to save time required to visit multiple web sites individually.

General Packet Radio Service. A technology, sometimes referred to as 2.5G, that allows customers to remain connected to the network between calls for the receipt and transmission of data. When using GPRS charges are based on the volume of data you send and receive.

High Speed Packet Access, widely regarded as the next enhancement to 3G, also referred to as superfast 3G.

Wireless Application Protocol is a standard for accessing online services through mobile devices. WAP gives you text-based information from the web in a format that is easy to read on a mobile screen.

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The length of time you can talk on your phone without recharging the battery. The battery capacity of a phone is usually expressed in terms of so many hours of talk time or so many hours of standby time. When you're talking, the phone draws additional power from the battery.

The length of time you can talk on your phone using the 3G network without recharging the battery. The battery capacity of a phone is usually expressed in terms of so many hours of talk time or so many hours of standby time. When you're talking on the 3G network, the phone draws additional power from the battery.

The length of time you can make a video call on your phone using the 3G network without recharging the battery. The battery capacity of a phone is usually expressed in terms of so many hours of talk time or so many hours of standby time. When video calling on the 3G network the phone draws additional power from the battery.

The maximum number of pixels that can be displayed on the screen, expressed as the number of horizontal pixels times the number of vertical pixels. The greater the number of pixels, the better the picture.

The number of colours your phone has in it will be reflected in the quality of the image that you can see when using O2 Active or Media Messaging. More colours give you a better experience. Typically phones have either 4,000 or 65,000 colours. Some of the original colour screen phones have only 256 colours. If a screen has no colour at all then it will be greyscale.