Telegram: The (possibly) secure WhatsApp alternative

Telegram is another in a string of competitors hoping to unseat the reigning champion of mobile instant messaging, WhatsApp. Promising unprecedented security and protection from prying eyes, it also claims to be speedier than its rivals and assures users it will remain completely free and devoid of ads, forever. But with WhatsApp promising to add voice functionality in coming months, can Telegram realistically compete with the current darling of the tech world?