I've been using a tethered iPhone 4 as my only internet connection for 18 months now. 250gb of downloaded games (Steam), iPlayer, youtube, and general browsing

I've been using a tethered iPhone 4 as my only internet connection for 18 months now. 250gb of downloaded games (Steam), iPlayer, youtube, and general browsing later - I can't help but wonder what the point of 4G is? I could play MMOs without issues, browse without concern, and generally enjoy a very low hassle internet connection all for not much more than line rental + normal broadband. I see the future as being fewer and fewer wires. But not whilst mobile phone companies charge heavily for data. Edit: To be clear I am on Three, and pay £35 a month for the phone + calls,text and unlimited tether. Uncapped broadband comes in at £20 a month minimum including line rental