SK 64 SMS Series (64-64,64-256,64-512) SK 64 channels series SMS Gateway is used to smoothly transit SMS between mobile and networks. 1 Channel Support 1-8 SIM Cards switching, which allows a great performance for cost-saving integrated GSM/LTE connectivity. It is suitable for enterprises, multi-site organizations, marketing, and areas with limited landlines like rural areas to cut down marketing costs and enable easy & efficient communications.