A dual-mode phone is a telephone which uses more than one technique for sending and receiving voice and data.
Mobile phones containing two types of cellular radios for voice and data.
These dual-mode handsets are compatible with both GSM and CDMA networks and are essentially two phones in one device.
Mobile phones contain both cellular and non-cellular radios used for voice and data communication.
These phones require compatible routers and modem to make VoIP calls.