You do not create a cellular unit by hand. It arrives provisioned to your organization, reports in on its own the first time it has power and signal, and lands on the dashboard marked as awaiting a store. Nothing is typed, scanned or paired.
Read next: Fleet overview: cellular units and fleets →Assigning it to a store is what makes it a monitored unit rather than just a device that reports numbers. Until then it records but alerts nobody.
Read next: Assigning a unit to a store →Name the unit for where it physically sits — "Kitchen, above the fryer", not "Sensor 3". That name goes into every alert message about it, and at 2pm on a hot Saturday the difference between those two names is whether someone knows where to walk. Assigning a unit that still carries its arrival name renames it to the store automatically; rename it on its own page if you want something more specific.
