Orbit -- A Better PhonebookFree
OrbitTM social phonebook is an application that will change the way you interact with your contacts while on-the-go. Orbit organizes your communications (Facebook, Twitter, email, SMS, etc.).
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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