WhatsApp was just updated to its version 2.6.1804. This update has fixed many bugs, and now includes a Group Chat feature! Take the update for a spin and tell us what you think.
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There are some ways to backup android phone contacts.
Sync to gmail is a common way.
Take a look at this article: KB13003-"JVM 513" error appears on the BlackBerry smartphone
You can also try: KB02141-Reset a BlackBerry