Mysterious cellular data usage in early morning

tortorlo2017

    I just used up all my 4GB of cellular data for this month.  This had never happen before. In the pass, the most I had ever used was about 2GB.

    When I check my data usage detail, I found there are some over 100MB usage everyday around 5-7am, while I was sleeping.

    I need to know what is causing this and how to stop it.

    I am using iPhone 7 on ios 11.1.2

    Thanks.

      All replies