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It sounds like you have Wi-Fi Assist turned on, which does exactly what you describe. To quote what it says in my settings tab - "Automatically use mobile data
by joshuatalb 5y ago
It sounds like you have Wi-Fi Assist turned on, which does exactly what you describe. To quote what it says in my settings tab - "Automatically use mobile data when Wi-Fi connectivity is poor".
To turn it off, on your iPhone, go to:
Settings > Mobile Data > Scroll to the very bottom > Toggle off Wi-Fi Assist.
- joshstrange 5y agoYes but data is data, it doesn't matter if I use 3G/4G/5G to talk to a server down the street or across the world, I've never heard of (consumer) bandwidth billing like this.
- ada1981 5y agoYes this should just be a domestic data charge, of which I am an unlimited plan holder. I made the call via FaceTime.