As a communications consultant, Carlyn Taylor knows her way around a wireless bill. So when her mobile-phone provider, Verizon Wireless, began offering unlimited calling for $100 a month, it didn't take Taylor long to figure out that the new plan would have sliced more than $500 from her bills in the past six months.
Taylor quickly made the switch, and she reckons that a slew of wireless consumers may soon do the same math. The Feb. 19 price change by Verizon Wireless was swiftly matched by AT&T Mobility (T) and T-Mobile USA. In all, 5% to 15% of the combined customer base of these three of the four largest U.S. cell-phone service providers will probably save by converting to the all-you-can-talk calling plans, says Taylor, who heads the communications and media practice at consultancy FTI (FCN).