If you’re one of the millions of iPhone owners who have already installed iOS 9, chances are you are pretty happy with it. But there’s something you might not be aware of…

If you tend to use Wi-Fi a lot because you have a limited data plan, you could be in for a major shock when your next cellular phone bill arrives.

By default, a new iOS 9 feature called “Wi-Fi Assist” automatically switches your phone from Wi-Fi to your carrier’s 4G network whenever it detects a weak Wi-Fi signal.  [Read more…]