WhatsApp
WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere. WhatsApp is fr
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Excellent chat tool.
You can send messages and make phone calls for free. Even better that the latest version is now encrypted end to end. Only thing could be improved is that occasionally the phone calls has some delays. Easy to use
I use WhatsApp everyday communicating with friends in different countries. Love it and it's very easy to use.