AT&T first launched its 5G+ coverage back in December 2018. The thing is that since then, that millimeter wave (mmWave) 5G has only been available to business users. That's changing this week.
This 5G+ coverage is different from the 5G that AT&T recently expanded to a total of 80 cities. 5G+ is based on mmWave spectrum, which offers faster speeds than AT&T's low-band 5G but isn't as good at reaching long distances or penetrating buildings.
To access AT&T's 5G+ network, you'll need a Galaxy S20 Ultra or Galaxy S20+, which are launching on March 6th. These phones offer support for both AT&T's mmWave-based 5G+ and low-band 5G networks, but the regular Galaxy S20 can only access the low-band 5G coverage.
Finally, AT&T customers who want to access 5G will need to be on an Unlimited Extra or Unlimited Elite plan.