Apple iPhone 4S

iOS 9.0

iOS 9.0 iOS 7 iOS 5

My Apple iPhone 4S iOS 9.0 uses a large amount of mobile data

Cause 2 of 3: Wi-Fi Assist is turned on

If Wi-Fi Assist is turned on, your phone will use mobile data when the connection to the Wi-Fi network is poor.

Step 1 of 4

Find "Mobile Data"

Press Settings.

Step 2 of 4

Find "Mobile Data"

Press Mobile Data.

Step 3 of 4

Turn automatic use of mobile data on or off

Press the indicator next to "Mobile Data" to turn the function on or off.

Step 4 of 4

Return to the home screen

Press the Home key to return to the home screen.

Press Settings.

Press Mobile Data.

Press the indicator next to "Mobile Data" to turn the function on or off.

Press the Home key to return to the home screen.