SK 8 SMS Series (8-8,8-32) SK 8 channels series SMS Gateway is used to smoothly transit SMS between mobile and networks. 1 Channel Support 1-4 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.