Today, Verizon is announcing the first two 5G markets and further details about the 5G Moto Mod intended for use with the Moto Z3. Starting on March 15, customers can pre-order the 5G Moto Mod for $50 by adding a $10/month surcharge to any Unlimited plan for 5G service. That Moto Mod has a full retail price of $350 and you'll need a Moto Z3 for the Mod to work, at least initially. Motorola would update previous-generation Moto Z devices to work with the Mod. We'd expect at least the Z2 Force would support it but the first-generation Moto Z, well... it's not certain. The 5G Moto Mod has...
Source: https://www.gsmarena.com/verizons_5g_moto_mod_going_up_for_preorder_as_carrier_announces_the_first_two_5g_markets-news-36005.php