There are many IMs in market and these
1. Whatsapp Messenger
This is the most popular one of all the IMs and is regularly running for last 8 years Whatsapp Messenger was an app introduced in iOS and later in android, free for a year and then they charged Rs. 55 a year after 1 year of free Whatsapp, now they have revised their decision and made it free for all. Whatsapp also supports voice call through internet. They’ve also introduced in private chats for end-to-end encryption on 5th of April.
Facebook messenger or Messenger as its called is also a different IM app, before it was available in Facebook app, but not only you can use it to chat, it can also be used for video calling and Voice calling purposes through the use of internet.
Another one of the IMs generally used for chats having all the features of above app but also have its own sticker shop so you can send custom stickers to your friends. This app is popular among many game players as many server based mobike gaming apps have the concept of teams and alliances so Line is their primary IM preference as one can only chat with other if they are in a group or they’ve been added by their username.
This is an IM having same features as above you can do voice as well as video call over thw internet and chatting too but the main thing about this IM is that its size is very less unlike the bulky in size IMs mentioned above.
5. Hike Messenger
Another popular messenger especially for its stickers which are vibrant and most of them are free to use in comparison with Line where you should have Line coins to buy them.