The Mack Institute asks
Before 1 July 2019, will AT&T, Sprint, T-Mobile, or Verizon offer 5G smartphones to US customers?
The development of 5G capabilities for smartphones is a step on the way to advanced use of cellular communications in autonomous vehicles (Reuters, Tom's Guide, Digital Trends). Smartphones with physical 5G add-on capabilities (e.g., Verizon's Moto Z3) will not count unless the required physical add-ons are also offered. For the purposes of this question, should the merger between Sprint and T-Mobile close the companies will continue to be counted separately.
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The question closed as "Yes, all 4 of the companies" with a closing date of 28 June 2019.