I remember reading about a 1980s design for cell phone bandwidth where they expected 95% of it to be voice and 5% would be for cell-tower techs to send short "text messages" to each other to keep the system running...And this is why the new plans at Verizon give you unlimited talk time but what varies your cost is how much data you use. Basically people aren't doing that much talking on their phones. They are texting and otherwise using data. So now price varies based upon data usage not based upon how much you talk.