id="article-body" class="row" section="article-body"> Samsung's Galaxy S10 5G is one of the first phones available for the next-generation wireless networks just now coming into service.

Sarah Tew/CNET It's one thing for wireless carriers like Verizon and Sprint to show off 5G speeds in this or that city. It's another to test the same phone on two different networks in the same town for a taste of how 5G competition is heating up. That's exactly what I did today in Chicago -- testing peak and real-world 5G speeds on the Samsung Galaxy S10 5G on both Verizon and Sprint.

Sprint, awaiting government approval on its pending acquisition by T-Mobile, on Thursday turned on its fifth promised 5G city, Chicago. That happens to be one of the two launch markets for larger rival Verizon's 5G service, which in our early tests yielded impressive speeds, if limited coverage.

Sprint's expansion into the Windy City, as the second carrier to offer 5G there, turns Chicago into one of the early