NEW YORK (TheStreet) -- T-Mobile's (TMUS - Get Report) controversial CEO John Legere showed some of his trademark bravado Thursday, declaring that the mobile carrier had passed its rival  Sprint (S - Get Report) in customers "several quarters ago."  

Meanwhile, a day after naming a new CEO, eLong (LONG), a provider of mobile and online travel reservation services, saw its shares soar more than 18%.

Wearing one of his hot pink t-shirts bearing the company logo, the T-Mobile CEO told Jim Cramer on CNBC's "Squawk on the Street" that "the yellow school bus (Sprint) is in the back." The interview took place on the same day hiscompany announced an initiative to add service in Mexico and Canada.

T-Mobile and other carriers have been intent on widening and simplifying their services as a way to entice new customers. They have felt the wrath of consumers, who complain that mobile plans are complicated and confusing.

Shares of the Bellevue, Wash.-based company rose 0.8% to finish at $38.76. Sprint shares dropped 1.5% to $3.89. 

The company ranks fourth among carriers behind Sprint, AT&T (T - Get Report) and Verizon (VZin most studies, but the feisty Legere has been intent on moving the company higher.

Verizon shares fell 0.8% to $46.23, while AT&T was down 1.2% to $34.37.

Earlier this month, he and Sprint CEO Marcelo Claure jousted via Twitter when Legere criticized Sprint's latest price plan. Claure responded with an expletive and called T-Mobile plan "misleading."

In January, the two executives exchanged barbed tweets over their respective Super Bowl ads. Legere said Sprint's Super Bowl ad was a "half-assed commercial, half-assed data speeds. #SprintLikeHell." Claure replied: "Never sacrifice your class to get even with someone who has none. Take the high road."

China's eLong gained 18.1% to finish at $15.05. The company had been buffeted earlier this week, dropping well below $13 a share.

On Wednesday, eLong announded the appointment Hao Jiang as its CEO. The company said Guangfu Cui, its former CEO, will continue to provide services to the company as a consultant.

eLong's Web site and mobile applications allow consumers to book reservations and gather travel information.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.