I am going to be reviewing the app Messenger from Facebook. One of the largest misunderstandings about this app is that you have to have a Facebook account to use it, which is wrong. It is very useful to be using a Facebook account for Messenger but it is not necessary. You can use your mobile number (like Viber) to sign up. It is a very useful app as many people use it and it is free.
​Click here for iOS or here for Android. There is also a browser version available here.