Mysterious cellular data usage in early morning


    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


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