The Equipment Installment Plan requires that you sign an installment agreement to pay for the smartphone, tablet, or feature phone in monthly installment payments. If you cancel your wireless service for that Corporate Responsibility User device, the remaining unpaid balance on the device is due. Also, you must be a qualified business or government customer to take advantage of an Equipment Installment Plan for your Corporate Responsibility User lines of service, which means a qualified wireless service agreement is required for the wireless service (for example, voice and data for smartphones).