Following in Verizon's footsteps, AT&T Inc. introduced plans in August that let a household share a monthly data allowance over as many as 10 devices. Asked about early results on a conference call with analysts Wednesday, AT&T wireless head Ralph De La Vega said one of the benefits of the plans is that it encourages people who have hung on to "unlimited" data plans to switch to a limited-data plan.

QUESTION: Is the Mobile Share plan getting people to add more devices to the network, and how will it affect your profits?