The latest Apple Update turned on WIFI assit when it's ALWAYS OFF. Now my DATA usage went through the roof in one day, 13G in one day!

[Brentaurban]

Verizon is acting like it's my fault... I think the obvious anomoly should be realized and the Data used should be credited back to the account. Verizon should go after Apple for restitution. This is because of the latest Apple Update on the phone turned on WIFI assist... This is NEVER on... I want to know if anyone else has experienced the same situation... Thank you.

[Salisbury]

     Brentaurban, on a iPhone 6s Plus I installed iOS 9.3 this week and it did not turn on Wi-Fi assist. The Verizon carrier software was also updated as well, which had no affect on the Wi-Fi assist.

[Weth]

Updated 2 phones, neither had wifi assist change.

[vzw_customer_support]

Let's see if we can zero in on where this additional usage has come from, Brentaurban. To start what apps show up as having used greater than 1 GB under the following Setting ( Settings > Cellular ) ? Addidtionally on this screen, when was the Last Reset as found at the very bottom? 
DavidH_VZW
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