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    <p>Not unless browsers start giving this information away through the DOM which, currently, they don't. There is a <code>navigator</code> javascript objects which holds many things but not what you're looking for. I've also read in the news recently that some cellular carrier was adding cookies to HTTP requests made on their phones. They were found to be adding customer IDs to cookies (huge security breach!!).</p> <p>Mobile Safari does add some new <a href="http://developer.apple.com/library/safari/#documentation/AppleApplications/Reference/SafariJSRef/_index.html#//apple_ref/doc/uid/TP40001482" rel="nofollow noreferrer">DOM additions</a> but not what you're asking for.</p> <p>Short of these options, you can't. Layers of the Internet Protocol are meant to encapsulate &amp; hide the details of the bottom layers. You can't detect Edge, 3G or Wifi any more than you can detect cable, DSL or finer optics.</p> <p>Finally, <strong>even if you could</strong> get this information, it wouldn't do you any good unless you had details of <em>every single node</em> in your TCP connection. For example, I could have the following setup :</p> <pre>iPad ---WiFi----> iPhone's Hotspot ---3G---> Carrier ---unknown--->>></pre> <hr> <h2>Addendum</h2> <p>In 2012-2013, the <a href="http://w3c.org" rel="nofollow noreferrer">W3C</a> was fleshing out <a href="http://www.w3.org/TR/netinfo-api/" rel="nofollow noreferrer">The Network Information API</a> which was aimed at providing <em>"an interface for web applications to access the underlying connection information of the device"</em>. <a href="http://www.w3.org/TR/2012/WD-netinfo-api-20121129/#attributes-1" rel="nofollow noreferrer">At the time</a>, the API stipulated that an "estimated" bandwidth for the browser would be obtainable via <code>navigator.connection.bandwidth</code>. <strong>As of April 2014, that work has since been discontinued!!</strong></p> <p><strong>Update:</strong> As of 20th October 2015, work continues on this API. You can find the latest <a href="https://w3c.github.io/netinfo/" rel="nofollow noreferrer">Editor's drafts for the Network Information API</a> on the W3C's github pages.</p>
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    1. POHow do you detect 3G vs. Wifi connection on mobile safari?
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    1. POHow do you detect 3G vs. Wifi connection on mobile safari?
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    1. COIt would absolutely be useful, especially for downloading assets. I would happily send screenshots of my product to a mobile device if I knew they were on a wifi connection
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    2. CO@Jason, it would be useful to know the download speed in order to send the right sized resources, yes! But a "Wi-Fi connection" on the end-point doesn't mean there aren't slower nodes in your connections. E.g. My iPad is connected to a wifi network, my phone's hotspot... But my phone only has 3G to the Internet. And that's just 2 jumps. How many jumps between your server and the user agent?!
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    3. COThat's fair, I suppose. Bandwidth rate would be ideal, but in the absence of that, the type of connection would allow me to make a better guess than what's available. "4G" is always going to be faster than "3G", and most of the time "WiFi" is faster than both of those. It won't always be right, but then again, GPS isn't always right and we still rely on that, right? ;)
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