Yes! You may cover any phone which is yours and in your possession. You do not need to have your phone paid-in-full.

Many of our customers have phones paid for on installment plans through their cellular carriers or other retailers.

When you register, the same process applies for adding your phone to your account. For uploading a receipt, just download a PDF or take a screenshot of your most recent bill/statement from the cellular carrier or retailer showing your installment payment and the type of device.