John Legere
T-Mobile CEO John Legere at the GeekWire Summit 2014.

T-Mobile will hold a surprise press conference call on Thursday morning, but it’s unclear what exactly will be announced.

The Bellevue-based wireless carrier issued its own press release on Wednesday notifying folks of Thursday’s 6:30 a.m. PT conference call. T-Mobile CEO John Legere may be tweeting hints about the announcement, the company said, but he hasn’t revealed anything thus far.

It could be T-Mobile’s next “Un-carrier” move; the most recent was the company’s new T-Mobile Tuesday giveaway app released in June.

Spurred by the arrival of Legere in 2012, the “Un-carrier” announcements over the past few years have ranged from unbundling the cost of the phone from a wireless plan to the Binge On streaming deal.

T-Mobile continued to grow rapidly in the most recent quarter, adding a net total of 1.9 million customers — its 13th consecutive quarter with more than 1 million new customers — bringing its total to 67.4 million customers overall.

The company still trails Verizon and AT&T in the U.S., but it has been growing faster than each in many respects.

Earlier this month, Legere penned a blog post to surface data released by Nielsen Mobile Insights that found T-Mobile tops its rivals in “customer satisfaction” and “likelihood to recommend.” He also keyed on a report from OpenSignal that found T-Mobile’s LTE network to be the fastest in the nation, and a new Speedtest report from Ookla that lauded T-Mobile’s success for the past 30 months.

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