AT&T
Introduction
AT&T revenue has large jumps in revenue followed be fairly stagnant numbers afterwards. There is visible cycle, but not really much seasonality to speak of.

Problem
AT&T has been unable to show any substantial growth except when the company acquisitions another company. While this method has appeased investors up till this point, there is only so many times this can happen until something breaks. Either there will be no options for acquisitions or the government may not allow anymore to happen.
Hypothesis
For the equation Y = f(X1,X2,X3); Y will represent AT&T's revenue, X1 will represent consumer price index for all items, X2 will represent real disposable income, and X3 will represent public perception. Consumer price index for all items relates to the prices AT&T use. Real disposable income will indicate how much money is out there to possible spend on AT&T services. Public perception is much more important currently than ever before. People prefer to buy products and services from companies that show they care about the world and community. Whether the caring is legitimate or not as long as the public perceives it and supports the causes, they will be more inclined to buy from that company over the competitors thought to be providing the same level of quality and/or service.
Alternatives
X1
While prices change due to internal and external forces automatically, changed in the value given per dollar can be changed. AT&T can provide incentives for customers that subscribe to Direct TV but not AT&T's wireless services. A promotion that gives the customers who switch to AT&T and/or renew contracts that also subscribe to Direct TV. This promotion could provide the new or returning customers free Direct TV for a few months. The amount of months can be decided through different avenues such as surveying.