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Yay! There’s a brand-new shiny iPhone and a brand-new iPhone upgrade. But if you’ve already changed your device over to iOS9, beware: A new feature called Wi-Fi Assist may be killing your monthly data usage and--much worse--adding up to hundreds of extra dollars on your cell phone bill. Here, we’ll explain.

What’s Wi-Fi Assist? This feature (turned on by default) automatically knows when you have terrible Wi-Fi and--without asking permission--will switch you over to cellular data so you have better service.

Whoa, what does that mean? Basically, it means that if you’re using the Wi-Fi at work or at home and your connection is spotty, your iPhone will try to do you a solid and find you a better network--even if that means costing you hundreds on cellular data in the process.

Yikes! What do I do to stop it? It’s easy. Just go into your settings and select Cellular. Scroll all the way to the bottom until you see Wi-Fi Assist and toggle the switch off.

Phew. Now go back to streaming Jane the Virgin.

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