: How to tell if an incoming connection is a cellular network or not I've got a page that will be loading a bunch of fairly high resolution images, as well as a full HD video. Is there a

@Yeniel560

You have the following general choices:


Examine the speed of the connection. You would have to devise some sort of bandwidth test that would attempt to tell whether you have a fast or slow connection. It sounds like this is what you really care about - there is no shortcut other than attempting to measure said speed.
Examine characteristics of the device. Using a number of heuristics such as size of screen, browser user agent, touch availability, etc..., you can estimate whether it's likely this is a cellular device. That of course does not tell you what kind of connection the device is on.
Examine where the connection comes from. Here you examine the origin of the client's IP address and attempt to identify it as coming from a cellular provider. This will involve building or acquiring some sort of knowledge base about IP ranges or reverse lookup domain names so you can correlate a particular IP address with a mobile provider.
You can allow the user to specify whether they want an SD or HD version of your site. Obviously, this is not automatic and therefore is not as desirable as an automatic option if you can get one to work, but is a possible fallback.

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