Whats App calls, which require a mobile or Wi-Fi internet connection, have been available on Android since the start of this year but were only recently added to the i Phone app.

LINE implemented the feature to its suite of apps in summer 2013.

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To the 310 million monthly active Snapchat users, many of whom are in their teens and early 20s: Sorry, but old people are about to crash your party. And that is exactly why the app is exploding in use, even recently overtaking Twitter in terms of daily users.

(I’m not even 40, and I’m one of them.) To the hip kids who have grown up with the four-year-old short video sharing app: It is with regrets that admittedly I may even incorrectly explain some of how this service—with its myriad of odd features—works. A social network where people share photos and short videos for just 24 hours, Snapchat is the answer to the Internet’s problem of never forgetting.

Both Whats App and LINE offer voice and video chats for free with in-app contacts around the world.

However – Whats App was recently criticised for draining huge amounts of mobile data for voice calls in comparison to rival services.

A shocking test by Android Pit has revealed that Whats App uses 1.3Mb of data per MINUTE when making a phone call.

This is not a problem if you are connected to an unlimited Wi Fi hotspot – but Whats App could quickly romp though a restricted 3G or 4G data plan.

Hidden from plain view, you have to know how to access them to use them.

Take an image, then swipe left or right while on the camera screen and you’ll see a filter slide over across it.

Instead of left- or right-hand anchored menus, Snapchat has users swipe to access other elements of the service.

For instance, from the camera, swipe to the right and the chat screen will appear, swipe down and your account preferences will drop in, and swipe left to view other users’ snaps.

Although both Whats App and LINE sport the ability to send text messages, photos, videos and voice calls over mobile data and wifi connections, LINE does have one major advantage. Whats App currently operates on a subscription plan of 69p per year – although the Facebook-owned app does offer one-year for free.