Technology is often a blessing but at certain times technology can lead to unforeseen and unwanted consequences.
If you got an iPhone and if you recently upgraded it to iOS 9, then beware! It has introduced an additional feature called WiFi assist. It can increase your mobile bills by many folds.
So if you have a crappy network plan and do not wish to have a herculean bill read this carefully. WiFi assist automatically turns to data if your WiFi connectivity is slow. This can cause you a hefty bill. it definitely is a cool way to stay connected when WiFi strength is poor, but you gotta worry about that damn bill too.
Here is how you can turn off this feature.