Galaxy S8+ U.S. Unlocked version not getting 4G LTE on AT&T only 4G

I am unable to get lte speed like my iphone 7 on same carrier.

I have an unlocked s8+ model sm-g955fd i am using with att

im getting like 3-4 mbps on a good day

did all the trouble shooting that att told :

factory reset, set apn setting for nextgenphone, reset network settings

nothing work

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