I bet this has something to do with the big surplus announcement:
Shares of AT&T drop as much as 4 percent Wednesday as two of its telecom rivals reported surges in subscribers.
Investors are viewing this as a zero-sum game — growth for Verizon and T-Mobile raises questions about how telecom giant AT&T fared.
T-Mobile adds 2.4 million subscribers in the fourth quarter, crushing expectations of 857,000, while Verizon brings in 650,000 new customers in the fourth quarter.