Sprint stock was up four percent on Wednesday in the wake of a cryptic tweet from CEO Marcelo Claure that hinted the carrier may have better first quarter results than predicted.

Claure’s comment came in response to a report that predicted T-Mobile will be the only carrier to achieve first quarter growth in net additions. By way of answer, Claure simply wrote “Hmm??”

According to the Wells Fargo Securities note cited in the report, T-Mobile is expected to post 960,000 postpaid net additions, compared to net postpaid losses of 200,000 for AT&T, 120,000 for Verizon and 75,000 for Sprint.

Claure’s response has mainly been read as expressing skepticism of this report, leading some to speculate Sprint may be positioned for positive net additions after all.

Sprint stock surged on the news, rising fairly steadily all day Friday. As of 1:45 p.m. ET Friday, Sprint stock was up four percent.

In January, Sprint reported record-low churn of 1.62 percent and 501,000 net additions for the three months ending December 2015.

Though Sprint has not yet announced the date of its upcoming quarterly earnings report, carrier reports more generally will begin next week with Verizon on April 21 and AT&T on April 26.