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Is there a way to set the phone to prefer cellular data over Wi-Fi so that it will use cellular if it's good but Wi-Fi if cellular is not? Similar to the "Switch to mobile data" setting but in reverse?

The intent here is while using internet as a passenger in a car and driving through areas where coverage isn't great, I bought a cheap prepaid hotspot from another carrier (that's providing the "Wi-Fi" referenced here), but I want my primary cellular plan on my phone to be used first rather than that.

Right now I manually switch between the two, but there are areas where which one is better changes quite frequently, so it'd be nice if this could happen automatically.

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This is probably not exactly what you wanted, but I experienced similar issues, and the way it sort of worked for me is either:

  1. Ensuring the Wi-Fi is of such an excrutiangly bad quality so that Android thinks it's an Internet-less connection and therefore only drops to it when the cellular is at absolute zero.
  2. To ensure that the phone thinks there is no internet over Wi-Fi, you could probably try blocking the URL it uses to check the connection, on your router. I remember there was a way to change the default generate_204 url in Android (see this: Change the server that Android uses for an internet connectivity check?) - change that to msftconnecttest.com/redirect or something that uses its own domain you're not afraid of blocking. (as the default gstatic.com is actually used for other purposes as well)

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