Currently, 5G is available for subscription only for customers who're on the $28/$18 base plan, at a special monthly price of $7 (Usual Price: $10/mo).
We're looking to enable 5G subscription for customers who're on Family Plan & Data-only Plan next. Call it a WIP!
We will not be enabling 5G for customers on our $5 Plan, $10 Plan, $0 Plan. We strongly recommend you upgrade to the $28 base plan so that you can get access to 5G subscription.