Greetings

I live in a rural area that I know has Skinny/Spark 4G network coverage - im on Skinny Mobile and a friend on the same property uses a modem to access Spark 4G wireless.
When I input my address on the Skinny website to get Wireless Broadband it says its not available and wont let me continue.
Is it possible to somehow get onto Skinny somehow anyway I know Spark4G is available and presumably once I have a modem I can access that?
Im thinking to buy a 2nd hand Skinny Modem off TradeMe and use that?
Any thoughts peoples?