This free messenger uses the algorithm AES for encryption, AES is strong and secure algorithm. Private SMS will be encrypted on the sender side and it may be read by the receiver only if key is known.
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Nimbuzz Messenger Free
Nimbuzz Messenger is a free chat & calling app that helps you connect to your IM & Facebook friends.
WeChat is all-in-one communications app for text (SMS/MMS), voice & video calls, Moments, photos