AT&T announced last week its 5G network has gone live in 10 U.S. cities. The network is available for users in Birmingham, AL; Indianapolis; Los Angeles; Milwaukee; Pittsburgh; Providence, RI; Rochester, NY; San Diego; San Francisco; and San Jose, CA. Customers can only use the network if they have a Samsung Galaxy Note10+ 5G smartphone and have either AT&T's Unlimited Extra or Unlimited Elite plans. The 5G network is in the low-band spectrum, which has slower speeds than millimeter wave spectrum but has a broader range, meaning it needs less infrastructure to be transmitted. Low-band 5G will play a large role in AT&T’s 5G coverage.