The aim of this paper is to study the symmetric algorithms like DES, RC5, AES, Triple DES, BLOWFISH etc. and to analyse their performance, mainly their beats and end memory requirements are studied to pick suitable algorithms to be implemented on the mobile and handheld devices. All the above algorithms will be first implemented in C, C++ or JAVA and their performances will be analysed. The suitable algorithm will be ported onto the mobile phones using Android. The proposal extends as when an encrypted message is sent from one mobile phone to the other, a standard and essential key is provided which is symmetric in nature. If any of the two or more parties want to open the message that is sent to them, they have to utilize the secret code in the provided key without leaving even a single digit. The message will be decrypted only after the full key version has matched with the given symmetry of the key. This makes the data or any information more secure even in the mobile devices for the common users by non-repudiation. This ensures the use of cryptography and its advantages by the end users of mobile phones for confidentiality.