If you ever use your iPhone on poor-quality WiFi networks, you may want to check your mobile data usage. As Quartz noted, a new feature introduced with iOS 9 is leading some people to see dramatic increases in their mobile data usage.
Wi-Fi Assist means that iOS recognizes slow WiFi and supplements it with mobile data. Great for ensuring your browsing experience doesn’t suffer, but it can come at a cost, with some users reporting that their iPhone is now using literally gigabytes more mobile data since upgrading. Unless you have unlimited data, that can get expensive.
Wi-Fi Assist is on by default, and rather hidden away in Settings, so here’s how to switch it off …
You can switch it off in Settings > Mobile Data (or, on Verizon phones, Settings > Cellular > WiFi Assist) – but you could be forgiven for not noticing it, because unlike other system-wide toggles which appear at the top of the screen, Wi-Fi Assist is tucked away at the bottom, underneath all the app-specific toggles.
This settings screen is also where you can check out your mobile data usage.
Apple reported a week ago that iOS 9 has experienced the fastest adoption rate of any version of its mobile operating system. If you still haven’t had time to explore it fully, check out our walk-through of the new features.
Via Business Insider
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Yeah .. I have 12GB surf every month. I rarely go over 5Gb but this time all the 12Gb went away :/ So this function will be deactivated.
Damn…how much does that cost? I still have the 30$ unlimited plan from Verizon…I have to pay full price every time I want a new phone but it’s so worth it; some months when I travel I download at least 100-200 GB…they would probably charge me an arm and a leg for that!
With my plan I get 6GB for 2 of my phones, I do a lot of beta testing and download plenty on Wi-Fi assist, has not affected me at all, my phone bill has been the same.
Jeez, turn it off to be precautionary. I can’t believe someone at Apple thought it would be a good idea to turn this on by default.
This was NOT enabled by default on my phone, I went in and enabled it
On my iphone 6 (Verizon) the switch was under Settings-Cellular-WiFi Assist. It was at the bottom of the screen as the writer stated.
Thank you! I originally couldn’t find it to turn it off…
Same here (T-Mobile).
Ditto!
I thought it had been removed in the Developer 9.1 Beta – but then I saw your post and it’s still there and was still enabled!
Thank you
Thank you! I was going crazy trying to find it. For once, Lovejoy confused me. :)
att grandfathered unlimited data plan ftw
A useful tip – thanks.
T-Mobile Unlimited Data FTW!