AT&T is launching its first 5G-compatible smartphone on June 17. The Samsung Galaxy S10 5G will become available only to AT&T Business customers and 5G developers initially. AT&T's 5G network is currently only available in a limited number of markets. This refers to AT&T's mmWave network, which has very limited coverage in 19 markets, all in metropolitan areas. The 5G phone will be available to only those on AT&T's new Business Unlimited Preferred plan or 5G developers' part of AT&T's 5G Developer program. If you are wondering, these customers will be able to get the Galaxy S10...