The service is offered on a no-contract, month-to-month basis, so you’re not locked to a specific plan.  However, most mobile hotstpots/routers are carrier locked to their specific network.  If you’d like the flexibility to switch between plans without having to get a new router each time, the MOFI4500 LTE Router is unlocked and cross carrier compatible.  Switching plans only requires a new SIM for the corresponding plan.