Though both business customers and subscribers using a carrier-specific service tend to be more loyal than most customers, the PTT market may not be a growth opportunity for carriers, according to Lopez. Users have many more ways to keep in touch than they did in the heyday of PTT, including SMS, Twitter and Facebook, she said. The need for PTT remains focused mainly in Nextel's original core user group of a few million customers, Lopez said.
Stephen Lawson covers mobile, storage and networking technologies for The IDG News Service. Follow Stephen on Twitter at @sdlawsonmedia. Stephen's e-mail address is stephen_lawson@idg.com
