Optimum Voice is a cable modem service available exclusively to Optimum Online customers providing unlimited calling to the the U.S. Virgin Islands, United States, Canada, and Puerto Rico, and requires Internet access via Optimum Online to complete activation. An Optimum Voice-ready cable modem will be provided for the term of your service. Upon cancellation of both the Optimum Online and Optimum Voice services, 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 to residential accounts. Optimum Voice does not support directory listed numbers, pay services or third-party billing. International Calling requires consumer activation via the My Optimum Voice Web portal. International calls are billed via credit or debit card and a minimum charge is required at set-up. Flat rate international calling plan also available. Per minute charges apply for calls made to destinations in the United States, Puerto Rico and Canada using remote access. Remote calls made from pay phones are subject to a $0.35 per call charge, in addition to the per-minute charge. 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 at http://optimum.net/store). 911 will not operate if you lose power. 911 service requires that customer provide notification to Cablevision if cable modem is moved to a different address. Cablevision does not support the use of any Optimum Voice service as a connection for (i) emergency medical alert systems, (ii) all high security monitoring systems (UL 681 or similar) or (iii) fire alarm systems (UL 864 or similar). Customer must maintain alternate phone connection for such connections. If keeping your current phone number, a transfer charge may apply to residential accounts.