Verizon calls out a more competitive wireless industry — and that’s weighing on its shares, as well as those of its peers.

Verizon stock tumbled after a wireless executive warned that Q1 wireless subscriber additions could be "soft" amid intensified competition.

Verizon will continue to provide the billing and customer service functions for its customers, Henson said, but customers will be able to use MSN's e-mail, subscriber-only content and other ...