hi, back when Vodafone were rolling out RBI they had a sort of plan they published with estimated dates for upgrading towers to 4G, 

is there such a thing for Spark? or anyone you can contact to find out?

i live rural and use Vodafone 4G  RBI , its awesome for speed but the overage rates have me looking round for what else is on offer

i don't have Vodafone hand held coverage where i live so use skinny 3G for calls and backup data for when the Vodafone goes down