These numbers can build trust with consumers, and those who still have landlines don’t have to pay for the cost of the call.

AT&T Inc. Dep. Pfd. (Rep. 1/1000th 4.75% Pfd. Series C) 0.58% AT&T Inc. Dep. Pfd. (Rep. 1/1000th 5% Perp. Pfd. Series A) 0.40% ...