You only can do that in few countries in which Bitcoin is legalized already. Beside in which countries Bitcoin is legalized already, you can use Bitcoin to pay or purchase anything you want but in other country where Bitcoin is not legalized yet, you will have to exchange it into local currency to pay or purchase and it's the same with my country.
It is not necessary to live in a country that has licensed Bitcoin to pay for it. States act slowly and sometimes these times last 10-20 years. And the states do research. There is no prohibition in this period.