SpeedSmart has published some early 5G speed test results for the new iPhone 12. Considering the iPhone 12 hasn't officially been released yet, there are a limited amount of test results.
While there have not been a ton of tests with the new iPhone, yet we do have some results for the 3 carrier networks in the US. Keep in mind these are early tests and a small number of tests in just a few locations across the country.
AT&T ● Los Angeles: 155.91 Mbps down / 24.63 Mbps up / 26ms ping ● San Francisco: 70.40 Mbps down / 14.77 Mbps up / 30ms ping ● Dallas: 200.67 Mbps down / 17.95 Mbps up / 27ms ping
T-Mobile ● New York City: 142.71 Mbps down / 51.20 Mbps up / 72ms ping ● San Francisco: 427.70 Mbps down / 49.60 Mbps up / 26ms ping ● Washington, DC: 457.21 Mbps down / 91.70 Mbps up / 18ms ping ● San Francisco: 77.60 Mbps down / 21.27 Mbps up / 68ms ping ● San Francisco: 91.30 Mbps down / 17.69 Mbps up / 71ms ping ● New York City: 621.30 Mbps down / 78.74 Mbps up / 21ms ping
Verizon ● San Francisco: 2007.13 Mbps down / 64.30 Mbps up / 13ms ping ● Chicago: 1136.91 Mbps down / 39.43 Mbps up / 14ms ping ● Chicago: 1477.61 Mbps down / 54.96 Mbps up / 21ms ping ● San Francisco: 714.36 Mbps down / 49.71 Mbps up / 13ms ping ● Los Angeles: 1017.12 Mbps down / 83.60 Mbps up / 19ms ping
Clearly, Verizon's millimeter wave network is the winner here; however, it's likely that most users won't be getting these speeds due to the network's limited availability.
SpeedSmart notes that AT&T seems to be using only Low Band 5G while T-Mobile has a mix of Low Band and Mid Band 5G leading to better speeds.