Are phones from the tello store unlocked to locked to sprint

Hello I referred some friend to tello and have accumulated enough tello bucks for a moto e4 from their store.

The phone has the bands for all four major carriers and would be great back up phone/test phone to try out different networks. Are phones sold by tello the manufacturer model or the carrier locked variant?

If the phone is locked to Sprint it would no longer be worth it.

carrier locked