The $5/month price is for the Relay functionality which provides the 2-hop traffic tunneling. I'm guessing(?) that's not more than your monthly phone bill? The

The $5/month price is for the Relay functionality which provides the 2-hop traffic tunneling. I'm guessing(?) that's not more than your monthly phone bill? The $90/month price is for unlimited mobile data, so it would in theory replace your phone bill entirely.