How to Use Your Android Phone as a Modem [4 Methods] - JoyofAndroid.com
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Definition of VoIP modem | PCMag
Amazon.com: Motorola MT7711 24X8 Cable Modem/Router with Two Phone Ports, DOCSIS 3.0 Modem, and AC1900 Dual Band WiFi Gigabit Router, for Comcast XFINITY Internet and Voice : Electronics
File:Acoustic modem and phone plugged.jpg - Wikimedia Commons