Viber. Just like Whatsapp, Viber is an online chat that uses contact numbers to identify users. When you register, you get a code sent to your mobile phone number. You can call users for free, send messages, images, and videos.

Is there an app just to chat?

HearMe is an app for iOS and Android that lets you talk one-on-one with a stranger. Youre not really talking -- this is a texting experience, which might actually make it a bit easier to open up to a stranger. Its just someone whos volunteering their time to talk to you, and youll never interact with them again.