With more than one billion users, WhatsApp Messenger is the most popular messaging application in the world.

The free app is available for Android devices, iPhones and iPads, BlackBerry handsets, Windows Phone devices or Nokia phones.

[Read more: WhatsApp: What parents need to know about the instant messaging app]

WhatsApp allows you to send messages to anyone who you’ve added to your WhatsApp contacts. It’s very much like text messaging but the app uses the internet to send the messages, rather than running down your text message allowance. WhatsApp sends messages over wi-fi as well as data, which means you won’t eat into your data allowance if you use the app over your home wi-fi or a wi-fi hotspot – any wi-fi connection really. Messages are free if you send them over wi-fi.

Just like text messages, you can also use WhatsApp to send photos, videos and web links. Group messaging is another popular feature – the same message will be delivered to multiple people in your designated group at the same time, for no extra charge. This means it’s an excellent resource for planning activities and events, or keeping up-to-date with friends and family members.

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You can also use WhatsApp on compatible Macs and Windows PCs.

If you feel like giving WhatsApp a go, here’s how to download it to your device. Remember that the app must be download to the device you want to use it on.

Whatsapp screenshot

How to download WhatsApp for Apple

Visit whatspp.com/dl using the browser on your mobile phone and follow the onscreen instructions. Alternatively, download the app from iTunes.

How to download WhatsApp for Android

Visit whatspp.com/dl using the browser on your mobile phone and follow the onscreen instructions. Alternatively, download the app from the Google Play Store. 

[Read more: WhatsApp's new status feature: Everything you need to know]

How to download WhatsApp for Windows Phone

Visit whatspp.com/dl using the browser on your mobile phone and follow the onscreen instructions. Alternatively, download the app from Windows Store.

How to download WhatsApp for Blackberry

Visit whatspp.com/dl using the browser on your mobile phone and follow the onscreen instructions. Alternatively, download the app from BlackBerry World. here.

How to download WhatsApp for your Mac

Visit www.whatsapp.com/download/ and follow the onscreen instructions.

How to download WhatsApp for your PC

Visit https://www.whatsapp.com/download/ and follow the onscreen instructions.

[Read more: Whatsapp: What parents and users need to know about the instant messaging app]