NEW YORK (TheStreet) -- Vonage Holdings (VG) - Get Report surged by double-digits after beating analysts' estimates for its second-quarter earnings. T-Mobile U.S. (TMUS) - Get Report spiked after posting a strong second quarter that exceeded Wall Street's estimates and also raised its 2015 subscriber growth forecast for a second time in the year.

Vonage Holdings soared 20.5% to close at $6.23.

The voice over Internet protocol (VoIP) provider surged after posting adjusted earnings of 9 cents a share on revenue of $221.9 million, compared with analysts' expectations of net income of 7 cents a share on revenue of $219.4 million, according to an Associated Pressreport.

Drilling down into the numbers, Vonage's business-grade services jumped 38% over year ago figures. It also now has 403,000 individual business users, compared with 217,000 a year ago, according to a Motley Foolreport.

T-Mobile surged 4.9% to end the day at $38.86.

The nation's No. 4 carrier soared after beating analysts' revenue and earnings estimates for the second quarter and raising its subscriber growth forecast.

During the quarter, T-Mobile earned 42 cents a share on revenue of $8.18 billion, compared with Wall Street's forecast of earnings of 18 cents a share on revenue of $7.94 billion, according to a Reutersreport. The report further noted that T-Mobile raised its subscriber growth forecast for the second time this year.

The carrier now expects to bring in an additional 3.4 million to 3.9 million users who pay based on usage on a monthly basis, otherwise known as postpaid customers, according to Reuters. That figure is up from its previous forecast of 3 million to 3.5 million additional customers.

T-Mobile's total user base is now 58.9 million, whereas No. 3 carrier Sprint has 57.1 million users as of March 31, according to a Bloombergreport, which noted Sprint is slated to update that figure next Wednesday when it reports its earnings.

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