T-Mobile has rolled out 5G in six cities but, according to CNET, the company is about to unveil nationwide 5G on December 6.

Many 5G deployments fall into two types: low-band and high-frequency. High-frequency 5G offers the highest speeds, but at the cost of range and ability to penetrate obstacles, such as trees and buildings. Low-band 5G, in contrast, is not as fast but offers far superior range and penetration, while still be significantly faster than 4G.

T-Mobile’s deployment-to-date has used high-frequency, millimeter-wave spectrum, the same kind of 5G that Verizon and AT&T are deploying. On December 6, however, the network T-Mobile will be activating will rely on their low-band spectrum. That difference will allow the company to provide service to upwards of 5,000 cities and towns throughout the country. It will also give T-Mobile an edge when it comes to building penetration in those cities.

T-Mobile has assured customers that existing plans will automatically have access to the new 5G service—with compatible phones—without any additional fees or plan changes.

Initially, the only two phones supporting the new spectrum are the Samsung Galaxy Note 10 Plus 5G and the OnePlus 7T Pro 5G McLaren, but it’s a safe bet that other manufacturers will be quick to incorporate support in their next models.