Sprint, days before what is likely to be the introduction of an LTE-equipped Apple iPhone 5, said it will expand its LTE network by 100 cities by the end of the year. - A Sprint rollout of 4G Long-Term Evolution services to an additional 100 cities within the carrier's 3G footprint is quot;under way, quot; with completion expected before year's end, the carrier announced Sept. 10. The reminder that it is hustling to catch up to the LTE deployments of Verizon Wirel...