The Iphone is only one piece of the momentum that is building up.

Second Piece:
Massive sales by Ericsson and their competitors on high speed networks like 3G and LTE.

Third piece:
mobile broadband enables Netbooks to be used as they were designed.

Fourth piece:
Social media applications(midlets and Symbian) for the cheaper devices are getting better and better

Thank you for a good post, made my day to get the opportunity to share some of my thoughts on mobility:-)