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How do you detect 3G vs. Wifi connection on mobile safari?

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How do I get my iPhone to use Wi-Fi instead of data?

Go to Settings > Cellular, then turn Cellular Data on or off for any app (such as Maps) or service (such as Wi-Fi Assist) that can use cellular data. If a setting is off, iPhone uses only Wi-Fi for that service. Note: Wi-Fi Assist is on by default.

How do I switch from Wi-Fi to mobile data?

The same setting on Android phones can be found in the Connections area of the Settings app. Go to the WiFi settings, tap the three dots in the corner to find the advanced settings menu, and then turn off the toggle that says "Switch to mobile data."

Why is Safari not using Wi-Fi?

Many times your ISP may have a lot of older routers laying arouno that they give to customers. Secondly, you might want to try clearing your safari history and caches in Setting> safari and see if that helps. Finally, try resetting network settings in Setting> general > reset > reset network settings.

What happens if I keep my mobile data and Wi-Fi both on at a time iPhone?

No. When data is enabled, it will only be used when you are not connected to wifi (iOS was built to prefer wifi).


I am specifically asking about javascript on a mobile webpage, not an objective-c application. Is there something like Apple Reachability for javascript so I can tell when Edge, 3G or Wifi connection is made or changed?