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Security and secrecy are some of the significant concerns in the communications world. In the last years, several encryption techniques had been proposed to improve the secrecy of the information transition. Chaos-based encryption techniques are being exceedingly studied as part of the because of the random-look nature and very unpredictable of the chaotic signals. In this study, a digital-based mobile communication system was proposed that uses chaotic encryption code, Arduino platforms was utilized for this work because it possess an open-source prototyping platform, software and hardware very accessible and extremely flexible to be customized and extended. The ASCII code of input message signal was encrypted using a Chaotic Random Number Generator it will send to the receiver side through mobile GSM system. In the receiver side, the ASCII coded message was decrypted using the same Chaotic Random Number Generator code for decryption. The target of this system is to make a more security based on the mobile communication system, the obtained results of this study confirm a secure system for sending and receiving SMS-based on the mobile communication system.