Credits pay for visibility on a load. Devices are one-time hardware. Mixing them up is the usual billing question.
A credit does not include a tracker in the mail. A tracker does not include unlimited load tracking. Buy the device that matches the asset, then spend credits on the loads you actually need on the map.
The GPS Tracking Mobile App listing in the shop is the phone path, not a physical unit. Full numbers: tracking prices. Sales: sales@locatemyfreight.com or 631-724-9400.