My China-bought s8+ is not getting 4G signals from At&t

I bought my unlocked s8+ from China, and I came to the United States for grad school a week ago. Bought my SIM from AT&T, it's supposed to be 4G LTE but I only have HSPA+ on my phone. Plus lots of functions that were active in China are disabled here such as Samsung Pay. Is there anyway I can get this work normally please?

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