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No, but wiring may be an issue. &nbsp;POTS &quot;plain old telephone service&quot; generally enters a building at a telephone company box. &nbsp;There is no telling what the phone company left connected to their side of the box, so that box should be disconnected from the house's phone wiring before the Verizon phone interface is connected. &nbsp;Once that is done, the Verizon interface can be plugged onto the house's phone wiring at any convenient phone outlet.<br />
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Note that if you live in an apartment building, it may be difficult to impossible to get at the pairs serving your apartment and confirm that they are no longer connected to the phone company lines.
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Often, check with verizon, they might terminate at the dmarc utilizing the wires in the house for the phones, while providing another coax feed through which your internet/tv subscription if any will work.<br />
You could use your existing phones.
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Yikes! I appreciate the answers but I need help understanding some of your terms.<br />
What is dmarc?<br />
What is OMT?
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If a home user subscribes to FIOS, do they need to purchase new phone equipment for the apartment (i.e. answering device, headset, conference phone, etc.)
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If a home user subscribes to FIOS, do they need to purchase new phone equipment for the apartment (i.e. answering device, headset, conference phone, etc.)

Verizon FIOS - Headset for telephone

A cellular phone (also known as a mobile phone, cell phone, hand phone, or simply a phone) is a telephone that can make and receive telephone calls over a radio link while moving around a wide geographic area by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. Mobile phones that offer services such as text messaging, email, Internet access, business applications, gaming, photography and more general computing capabilities are referred to as smartphones.

Cell Phones

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.