A digital cable box with Optimum TV service is required for all features. Web DVR requires DVR for Optimum TV and Optimum Online. DVR service requires digital cable box with DVR capabilities. An active Optimum Online ID and password is required for online DVR management. Caller ID on Optimum TV is only available to customers with all three Optimum services (Optimum TV, Optimum Online and Optimum Voice). The Caller ID on Optimum TV function will not distinguish between multiple lines. Optimum App requires Optimum TV w/cable box or CableCARD, Optimum authorized modem and wireless home router. All devices currently not supported. Minimum system requirements apply and require app download and installation. Available to residential customers only.