posted this on February 29, 2012 15:02
The important part is adding the contact into your phone's address book. Before you begin, please ensure your phone is connected to the internet with a strong signal.
To be able to chat with a friend:
If you still cannot chat with your friend, contact us with your friend's number in full international format and we will check in our system.
For instructions specific to your phone type, learn how to add a friend on: iPhone | BlackBerry | Nokia | Windows Phone.
Cheers,WhatsApp Support Team
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