NEW YORK (TheStreet) -- About 15 million T-Mobile US(TMUS) - Get Report customers were affected by a data breach that hit consumer credit company Experian, CNBC reported Thursday.

"Experian announced Thursday that one of its business units had been hacked," CNBC said. "The breach occurred on a server that contained data on behalf of one of its clients, T-Mobile.

"The data include personal information for a combination of about 15 million customers and credit applicants in the U.S. The data included applicants requiring a credit check for service or device financing from Sept. 1, 2013, through Sept. 16, 2015." Experian said its own consumer credit database was not affected, according to CNBC.

In a letter to consumers, T-Mobile CEO John Legere said:

"Obviously, I am incredibly angry about this data breach and we will institute a thorough review of our relationship with Experian, but right now my top concern and first focus is assisting any and all consumers affected. I take our customer and prospective customer privacy very seriously. This is no small issue for us. I do want to assure our customers that neither T-Mobile's systems nor network were part of this intrusion and this did not involve any payment card numbers or bank account information.

"Experian has assured us that they have taken aggressive steps to improve the protection of their system and of our data.

"Anyone concerned that they may have been impacted by Experian's data breach can sign up for two years of free credit monitoring and identity resolution services at www.protectmyID.com/securityincident."

T-Mobile shares finished the day at $40.14, a gain of less than 1%. They sank by 1.4% in after-hours trading.

Sprint(S) - Get Report is preparing to cut an unspecified number of jobs and eliminate up to $2.5 billion in expenses in the next six months, the Wall Street Journal and Reuters reported.

Sprint shares jumped by 5.5% Thursday, closing at $4.05. They rose by 2.7% on Wednesday.

The nation's fourth-largest wireless carrier has frozen all outside hiring, the Journal said.

"We have begun an effort to significantly take costs out of the business so the transformation of the company will be sustainable for the long term," said Sprint spokesman Dave Tovar in an email to Reuters, the news service reported.

The planned cuts come on the heels of a third investment in Sprint by majority owner SoftBank Group (SFTBY) . SoftBank invested another $204 million in Sprint in September, Bloomberg reported Wednesday, bringing its total stake in the Overland Park, Kans., company to about 83%. SoftBank made two other investments in Sprint in August.

Dish Network(DISH) - Get Report affiliates on Thursday "surrendered 197 spectrum licenses to the U.S. government after they were declared ineligible for $3.3 billion in small-business discounts earlier this year, according to a senior U.S. Federal Communications Commission official," Reuters reported.

Dish Network's stock closed at $58.80 Thursday, a slight increase of less than 1%. They declined in after-hours trading, also by less than 1%.

"Dish Network's affiliates, Northstar Wireless LLC and SNR Wireless LicenseCo LLC, on Thursday paid a penalty of $413 million for defaulting on the licenses worth $3.3 billion that they decided not to pay for," the news service reported. The 197 licenses will be re-auctioned by the FCC. 

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