For the purposes of this site a meg is short for a Megabyte, which is a measurement of the data being transfered between the remote web site and your mobile phone. A single character (either a number or a letter) takes up one byte. A Megabyte is 1 million bytes (* In fact it's because this is binary it's actually 1,024 x 1,024 or 1,048,576 bytes, but don't let that worry you !).
A Kilobyte (or simply 'K' or 'KB') is 1,024 bytes.
Mobile network operators typically (but not always) charge for services based on the Megabytes transferred in a specified period (day/week/month).
See
Wikipedia for a detailed explaination of bytes, kilobytes, megabytes and gigabytes.
Data within pictures, video, ringtones, and any other "packet" of information is part of the data usage. This also includes the presentation markup (WML, HTML, etc) and client-side scripting such as Javascript or Flash.
The usage calculator on the Schedule Builder pages use the following asumptions ...
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a mobile internet (WAP) page - 8 KB
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a regular (HTML) web page - 25 KB
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a regular plain text email - 3 KB
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a HTML Email - 25 KB
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an email with one file attachment - 1 MB
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a mobile sound track (such as ringtone) - 1 MB
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an MP3 music track - 3½ MB
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a video clip - 4 MB (for every 2 minutes of video)
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a 1-Megapixel photo - 580 KB
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a 4-Megapixel photo - 1½ MB
All of these apply regardless if you are uploading (copying information to the web or sending emails) or downloading (copying information from the phone to your mobile or recieving emails).
