Using cellphone data when connected to Wi-Fi

Tanaporn wrote:

WHY IS DATA BEING USED FROM MY CELLPHONE PLAN WHEN I’M CONNECTED TO HOME WIFI?

I USE A GIG OF DATA THIS MORNING WHEN I WAS ASLEEP NOT EVEN USING MY CELLPHONE AND CONNECTED TO WIFI.

SERVICE NAME CHANGED TO INTERNET ACCESS, ON PREVIOUS BILL IT WAS CALLED CELLPHONE DATA.

I DO NOT HAVE TMOBILE INTERNET AT HOME, I USE SPECTRUM

Do you have an iPhone or Android?  Data is required.for some features of the device to work.  Being connected to WiFi does not stop your device from accessing cellular data.  You can, in future, put your device in Airplane Mode and then turn on WiFi.