You must have received a call from an unknown number. Some of them would be spam or promotional, and you would dismiss them. Often you would have suspected them of being someone known or a fraudulent ...

Losing track of your own phone number is disconcerting. It’s also something that happens frequently enough. Human memory is imperfect anyway. Making it an issue for just about everybody at some point.

WhatsApp is one of the most popular messaging apps and aims to become a social media platform. The service is convenient. It allows users to text friends and relatives across the world at no cost, ...