https://www.theregister.co.uk/2018/08/06/motorola_5g_mod/

With the standalone 5G spec (3GPP Release 15) nailed down in June, it was only a matter of time before the first phone was formally announced. And as expected, it isn't a phone at all, but an addon that clamps to the back of an expandable Motorola phone.

Verizon has earned the bragging rights to be the first to deliver commercially available 5G by becoming the exclusive launch vendor of the Moto 5G Mod, which will be available, presumably with supporting network coverage in demo locations, in "early 2019". Huawei has promised an integrated 5G phone for "2H 2019".