Reason being with iPhone that the voice needs to be rerouted through their respective US networks (NSA and all that), these agencies add the extra costs, you pay to get recorded and exploited – they avoid legal matters by being established as a non-profit charity so you are strictly giving donations. The problem however with the upcoming VAT on digital goods (the voice call is streamed into data through the routing process) is that the rerouted call via the States will also be charged with VAT so you will soon need to add 14% on your iPhone calls, this is not even taking the local network service providers in consideration.
BB have rights to sell your details to the highest bidder, no need to add extra costs, all-inclusive hence their agreements.
Do you ever read your contracts and additional terms & conditions?