Developing for the Mobile Web can be a daunting task considering the varying sizes of screens out in the market today.  It would be useful to categorize devices into groups and platforms.  The following are suggested groupings per platform:

1. Symbian

Symbian screen sizes grouped into tiny screen, small screen, medium screen, and large screen

Symbian screen size grouping for the Mobile Web

2. BlackBerry

BlackBerry screen size for portrait 240 x 320 px and landscape 320 x 240 px

BlackBerry screen sizes for Mobile Web

3. iPhone

iPhone screen sizes: 320x480 px, 480x320 px

iPhone screen sizes for the Mobile Web

4. Android

Android screen size grouping small screen, normal screen and large screen

Android screen sizes for the Mobile Web

Based on the groupings, the large screen size for Symbian and Normal screen size for Android seem to cover also iPhone and BlackBerry.  Hence, screen widths from 220 px to 480 px would cover the most variety of devices.  Although you could still expand or contract the target devices for your mobile web site, this would be more of an economic decision.  One thing is certain though, you need to specify the target devices that you are building for.  That way, you would have set the expectations with your client.

Sources:
Symbian
BlackBerry
iPhone
Android

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