The iPhone, starting with firmware 1.1.3, features a geopositioning system what works by triangulating on both cell towers and Wi-Fi access points. This produces approximate geographical coordinates that can be shown on a map.
To use this feature launch the Maps application, and tap the icon on the bottom-left corner of the screen.
Note that this features requires you to have an active wi-fi or EDGE connection (this is used to download the coordinates of the cell towers).
Check out this page on Wikipedia for more technical information about GSM localization.
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No, it does support only 802.11b and g.
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Yes, the iPhone's built-in browser offers grat support for JavaScript, and in most cases no code changes are required to make an existing website work with it. JavaScript can optionally be disabled from the Safari Settings.
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Unfortunately this is not possible right now, and no public announcements for a future support have been made yet.
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