T-Mobile CEO John Legere accepts the award for CEO of the Year at the 2018 GeekWire Awards.

Verizon today lit up what it called the “first commercial 5G network on the globe,” but T-Mobile CEO John Legere was not impressed, unleashing a trolling tweet thread roasting the mobile giant Monday.

The Verizon service is now live in parts of Houston, Indianapolis, Los Angeles and Sacramento. The race to 5G has been highly competitive among carriers, and while Verizon has planted its flag as the first to offer a next-generation home network, its mobile 5G plans remain to be seen until next year, as The Verge notes.

In his thread, Legere drops an asterisk next to Verizon’s new 5G product, and says T-Mobile has a different 5G vision that will scale faster than Verizon’s.

T-Mobile is working on its own plan for nationwide 5G, and that is a big reason why it is acquiring former rival Sprint. In recent months, T-Mobile has inked deals with Ericsson and Nokia totaling $7 billion to help build out T-Mobile’s next-gen network.

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