How to Switch from At&t to T mobile ?


    I had t-mobile for several years but I moved and the area I live in, doesn't have t-mobile service.

    Now I'm back and again want to use T mobile but my problem is that after switching there will be no any issue to my phone storage data and the others privacy content I have my site details so my main question is that its very important details so while switching there is no loss of any details and data ?

    please help to clear my query

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