It's the early days of summer and all four major carriers are now operating some form of mobile 5G in the US.

T-Mobile is the latest to push out six cities in the United States. The operator has switched on millimeter wave (mmWave) in Atlanta, Cleveland, Dallas, Las Vegas, Los Angeles and New York.

Much like AT&T and Verizon, T-Mobile is initially using high-band millimeter wave for these connections. It is currently offering a Samsung S10 5G smartphone as its only 5G-capable device so far.

All of T-Mobile's current 5G maps are here.

Here's a list of all mobile 5G currently offered in the US:

AT&T
Frequency: 39GHz
Cities (partially) covered: Atlanta, Austin, Charlotte, Dallas, Houston, Indianapolis, Jacksonville, Las Vegas, Los Angeles, Louisville, Nashville, New Orleans, Oklahoma City, Orlando, Raleigh, San Antonio, San Diego, San Francisco, San Jose, Waco
Speeds: 1-Gbit/s+
Devices: Netgear Nighthawk 5G MiFi, Samsung S10 5G smartphone Audience: Businesses, developers

Sprint
Frequency: 2.4GHz
Cities covered: Atlanta, Dallas-Fort Worth, Houston, Kansas City
Speeds: 300-500 Mbit/s
Devices: LG V50 5G ThinQ smartphone, Samsung S10 5G smartphone, HTC Hub 5G MiFi
Audience: Consumers

T-Mobile
Frequency: 28GHz
City centers covered: Atlanta, Cleveland, Dallas, Las Vegas, New York
Speeds: 450-530 Mbit/s
Devices: Samsung S10 5G Smartphone
Audience: Consumers

Verizon
Frequency: 28GHz
Cities (partially) covered: Chicago, Denver, Providence, Minneapolis
Speeds: 1-Gbit/s+
Devices: Samsung S10 5G smartphone, LG V50 5G ThinQ smartphone, Motorola v3 and v4 smartphones with 5G modules
Audience: Consumers

Why this matters
All of this will change as more 5G devices that support lower-band frequency modes arrive. T-Mobile will launch "nationwide" 5G later in 2019, with AT&T following in 2020. Verizon is planning to roll out 30 more mobile 5G cities on mmWave this year.

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— Dan Jones, Mobile Editor, Light Reading