AT&T rolled out a new agenda for its wireless business that can be summed up in one word: Growth. "The real story on service revenue is customer growth," explained CEO John Stankey during the operator's quarterly conference call Wednesday. "We're optimistic about our ability to keep growing that customer base. That's what's driving the service revenues." The company's efforts are important considering mobility remains AT&T's largest and most important business, accounting for 44% of its consolidated revenues. So how will AT&T pursue new customers throughout 2021? "We're going to look at our p...