I am looking for a WiFi hotspot that works in USA.

I have a M7450 that I had with me when visiting th US

and was hoping that I could use my 4G sim to be able 

to connect and get WiFi on several devices using the

M7450 as a hotspot. My smartphone worked fine and 

the sim that I put into the M7450 worked fine in my smartphone

but wouldn't connect at all. I think I read somewhere that 

the M7450 wouldn't work in the US.

Does anyone know for sure which TP-Link WiFi hotspot

device does work in the US?
 

William