A method of encoding digital information in order to suppress dc includes the steps of receiving a sequence of m message bits of a message word, and mapping the sequence of m message bits of the message word to a codeword, of length n bits, generated from the m message bits using algebraic operations. More specifically, it intends to perform primary functions using the principles of design, allowing an array of third party smart cards to share the motherboard of the universal cellular circuit, thus, allowing for ease of switching service providers by simply pushing a button on the apparatus. In some embodiments, a wall disposed between the rigid and flexible materials is angled andor bent to increase bonding strength between the rigid and flexible sections. A new data indicator is introduced to indicate the start of a new packet.