Since AT&T was blabbering about stock buybacks recently, that tells me that the dividend is secure, for now. AT&T is first an income stock, and second, a growth stock mainly because the dividend yield is very competitive compared to a bank deposit.
If that dividend is in trouble, they could have a shareholder lawsuit, given all the blather about share buybacks. But, I don't see that. However well or poorly DirectTV does is subordinate to their ability to service that dividend. However, something serious at Wireless or Time Warner would cause me to wonder about the future. The only thing I want to hear about landline telephony is that they mothballed it.