US unlock Sprint Samsung Galaxy s8 PLUS SM-955U

I'm trying to use it on Tmobile network the signal says GSM speeds are EDGE not good at all. I got the setting on GSM/UMTS and T-Mobile apn setting not working right at all. I don't know the apn I got wrong I try a couple different ones but no LTE speeds at all. Please help I'm not good at this I'm been working on it all day to find the correct settings. I was told it would work.

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