LTE not availabe Xa Ultra

[Mohvw32]

Hi, I just need to know why LTE/4G service is not available on my Xa Ultra, note that my friend has the same problem with his Xa Ultra too, both phones purchased last year from the USA?

[Uliwooly]

@Mohvw32

https://www.sonymobile.com/us/products/phones/xperia-xa-ultra/specifications/