To send text messages free of charge using an existing mobile number, you can use this system like SMS messenger and install it on your mobile device. This apk is an application that enables you to text and sends small images to other this apk's users without charge. To send a secure message, secure sessions must exist between the sending device and all the recipient's devices. Asymmetric key cryptography algorithm RSA is used for encryption and decryption of the message. The user can obtain

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... security of text messages using RSA. This system provides a secure message on the mobile phone. Every SMS packet contains 140 bytes of effective data. Mobile users send short messages to the short message center through mobile terminals, and then the short message center transmits these short messages to target users.