As critics line up against the proposed $39B mega-merger between AT&T (T) and T-Mobile...

|By:, SA News Editor

As critics line up against the proposed $39B mega-merger between AT&T (T) and T-Mobile (DTEGY.PK), Sprint (S) ratchets up the pressure, formally asking the FCC to block the takeover while urging consumers to send Twitter messages. Sprint shares have jumped 13% in the past two weeks, and some see the rise as an "interesting tea leaf" forecasting the deal's fate.