Optimum Voice is a cable modem service available to residential customers providing unlimited calling to the United States, Canada, Puerto Rico and the U.S. Virgin Islands. An Optimum Voice-ready cable modem will be provided for the term of your service. Upon cancellation, customer must return the modem or be subject to a non-return fee of $100. If keeping your current phone number, a number activation fee may apply. Optimum Voice does not support, pay services or third-party billing. International Calling requires consumer activation via the My Optimum Voice Web portal. Optimum Voice uses household electrical power to operate and will not function in the event of a power outage (a back-up battery can be purchased separately). If keeping phone #, transfer charge applies. W/o battery backup, if you lose power, if service is disconnected or if broadband services are disrupted or disconnected, 911 service will disconnect and not function or operate. If moving, new address must be provided before 911 can function properly. A 50¢ charge per line covers certain NY taxes on Optimum Voice. Optimum Voice residential multiple lines (up to maximum of 4 total lines) avail at addt'l charge of $14.95 per line & req multiple-line modem. Optimum Voice World Call available to Optimum Voice customers in good standing only. Monthly rates and limitations apply. Direct dial from customer's Optimum Voice phone. Calls to satellite phones & audio text lines/destinations not available.