very slow 0.1 mbps download and upload speed with full 4GLTE service

bstep

    I'm using an unlocked Samung Galaxy s8 active (previously ATT) and recently joined a Tmobile family plan. Every other phone on the plan is getting over 20mbps download, but mine has been excruciatingly slow from the beginning. At the very beginning when I joined I had no data whatsoever, and I went into a Tmobile store and the guy looked into the account and said he needed to "turn on the internet box."  After that I have gotten data but it's so slow its nearly unusable.

     

    Any inklings on what's going on?

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