SK 32 SMS Series (32-32,32-128,32-256,32-512) SK 32 Series SMS Gateway is a 32-channel GSM SMS Gateway used to smoothly transit between mobile and networks for the transmission of SMS. 1 Channel Support 4-10 ports 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.