@guftgift 

Hi,

This cannot be answered so easily.

First you need to ask AIS SIM2FLY if they support data roaming in the USA at all and, if they do, what their roaming partner in the USA is. (like AT&T, Verizon, T-Mobile)

Once we have this information we can look up what 3G/4G bands that mobile network operator uses and then compare that with the list of bands the M7450 supports. (which you can find here https://www.tp-link.com/th/home-networking/mifi/m7450/#specifications)