Default [Q] LTE use in other countries

I really want to get my hands on an HDX. I could get one from amazon Germany - but they say that LTE functionality in Switzerland is not available at the moment.

Now I am wondering whether it is a Hardware or software issue?
In Switzerland we use the 800, 1800 and 2600MHz bands.

Can anyone help or has anyone actually bought a device in one country and successfully used LTE in another?