Disable mobile data when connected to Wi-Fi

As many on this forum have discovered the hard way, your data limit can get eaten up quickly if you do not manually disable mobile data when at home or at work when connected to Wi-Fi.

Interestingly, I had Straight Talk for 8 years and bought only one GB of data per month and I never once came close to using it all. On Xfinity mobile, I have gone over the 1GB limit in less than a week. I'm not sure how Straight Talk did it, but when I was connected to Wi-Fi it did not use mobile data. At any rate, if you call Xfinity Mobile, they will simply tell you to turn mobile data off when at home. Of course, if you send a text with some kind of media attached you have to turn the mobile data back on, blah blah blah. Ridiculous for 2022.

I came across this option and just enabled it so I can't speak to how well it works but I offer it as a possibility for automatically turning off mobile data when connected to Wi-Fi.

These instructions are for Android but there is something called Wi-Fi Assist on iPhones that is similar. For Android...

First you have to turn on Developer Mode. Open settings and in the search bar type... Build Number. When your search returns the build number result, tap it and it will open the setting... Software Information. Scroll down until you see Build Number and tap it seven times. This will turn on Developer Mode.

If this does not open developer mode then you already have it turned on. Simply type... Developer Options in the settings search bar. (BTW, there is a developer setting under... Accessibility. This is NOT the one you want.)

With... Developer Options opened. Scroll down to... Mobile Data Always Active. Be sure this is turned off. You'll note that it tells you to leave it on for faster network switching. This causes me to wonder if there will be some kind of lag or disconnect on phone calls. As I said, I have not tried this but I'm desperate. If this doesn't work I'm switching carriers.

Supposedly, this will turn off mobile data when you are connected to a strong Wi-Fi connection. 

I'll try to update this after I've had it on for a while. Meanwhile, I'm eager to hear from anyone who has tried this.

I have reported this mobile data eating behavior to the FCC because if straight talk is able to disable mobile data when I'm connected to Wi-Fi without me changing a single setting, then Xfinity Mobile can do it too. Therefore, they're not doing it [Edited: "Inflammatory"]. At the very least it's disingenuous, [Edited: "Inflammatory"]. In my case, at 1GB, all it will take is me to forget to turn off mobile data about two times per month while I'm at home... then boom, I'll be over the limit. Ridiculous beyond belief!

Good luck!