Mobile VoIP or 'Mobile Voice over Internet Protocol' is the application of voice over IP technology to mobile handsets.

Mobile VoIP requires a mobile handset that supports, at minimum, high speed IP communications. Most commonly this is using Voice over WiFi or VoWiFi, but the same protocols (typically SIP or jabber) can be used over any broadband IP-capable wireless network connection such as the various 3G standards, EVDO rev A (which is synchronously high speed - both high speed up and down), HSDPA or potentially WiMax.