This study shows an encryption method for Short Message Service (SMS) to reduce amount of required memory space of data for device or to increase the number of bytes to transmit. SMS is a very popular service. SMS are developing very rapidly throughout the world. As SMS is an offline message service it`s a huge pressure for server memory. In traditional SMS system it is possible to send maximum 160 characters and each character occupies one byte of memory space. In this study an encryption method is present by which each character occupies less than a byte and will save huge mobile set memory space and at the same time present encryption method will save server memory space.