Dinstar Multi-SIM VoIP GSM/3G/4G Gateway adopts the cutting-edge Multi-SIM technology, 4 SIM slots per 1 GSM/3G/4G channel, enables the easily transit between mobile and VoIP networks. https://www.gsmgateway.in/dinstar/GSM-3G-4G-VoIP-Gateway/Multi-SIM-VoIP-Gateway.html