New communication networks typically start as complementary systems that extend the reach of an established network to areas it could not penetrate. For instance, people had to walk to a telegraph offi ce to send a telegraph and conversely a delivery person had to deliver a telegraph to the home of the recipient. The telephone extended the reach of the telegraph to the homes of individual customers and thereby eliminated the need for hand delivery of messages. Similarly, cellular networks extended the reach of wireline networks to the places they could not reach-moving vehicles. Today, we are witnessing the growth of mobile networks that extend the reach of the Internet to mobile environments. However, the similarity ends there in one very signifi cant way.