With its network now within reach for 300 million people, T-Mobile can now see the rear bumpers of AT&T and Verizon.

It's a milestone the nation's top two carriers hit over a year ago, but along with T-Mobile strong net adds, quarter after quarter, it evidences the company's growth into a threatening rival to AT&T and Verizon.

T-Mobile's 300 million PoPs (Points of Presence) represents the number of people the wireless carrier is now able to reach with 4G LTE. It's an achievement T-Mobile set out to accomplish before 2015 ends.

T-Mobile also enjoyed its tenth straight quarter of adding at least one million new customers, boasted John Legere, president and CEO of T-Mobile.

"We've had 10 quarters in a row with over 1 million net new customers, 5 with over a million branded postpaid customers and a total of 2.3 million new customers this quarter alone," said Legere. "Our momentum is strong and our incredible customer growth is translating directly into solid financial growth which makes it crystal clear that putting customers first is just good business."

All of that customer growth has translated into some impressive finances, says T-Mobile. The company reported $7.8 billion in total revenues, up about 7 percent year over year, during the third quarter of 2015. About $6.3 billion of that came from services, which constitutes an 11 percent increase year over year.

But just because T-Mobile has picked up speed doesn't necessarily mean it'll catch the U.S.' top two wireless carriers. In the summer of 2014, T-Mobile boasted it surged past Sprint's 230 PoPs for 4G LTE at the time and AT&T was closing in on Verizon's 306 PoPs.

And this past summer, AT&T announced that it was stepping up its efforts south of the border with the intent to reach 100 million more people in Mexico.

With the regulatory climate more favorable to competition in the Mexican market, AT&T thinks that 4G and the mobile Internet will provide an economic boost to the country in a similar fashion as the combo has done in the US, stated AT&T CEO Randall Stephenson back in June.

"Beyond accelerating economic growth, the mobile Internet is about changing the way people live and work, keeping families better connected, opening up new educational and health care opportunities, and strengthening and empowering communities," said Stephenson.