there is an application that is becoming very popular as well as providing instant messaging service that allows phone calls and send text messages for free, this application is called Viber. Viber application can be installed on any BlackBerry brand team in the iPhone and any other smartphone that uses Android or Windows operating system. Once you have it installed you can call and send SMS to all your contacts who also have installed. Even if you have the most current version of Viber, you can create your own groups to chat. Viber will also have the option to share with your friends any image you have in your computer and even take a photo, put text in it and send it to one or more of your contacts at the same time.
Services like this that give free calls and other communication services for free to other in-network users are numerous, but what I find more interesting with services like KakaoTalk is that it uses your phone number to identify you and does not require you to register for a username. First advantage of Kakaotalk is ‘Group Chatting’ function. In my opinion, this advantage is the best advantage of Kakaotalk, compared with a text message. And second, Kakaotalk are connected with the game, like ‘Cookie Run’ and ‘Dragon Flight’. Because Such games are based on kakaotalk, we can compete with our friends. Third, kakaotalk has a many appropriate emoticons. these emoticons are help us express our emotion and thoughts, without talking.
However, Kakaotalk also have a big disadvantage. If I read the Kakaotalk message, usually I can’t ignore that message. Because kakaotalk have a ‘read alarm’ funtion, if I read a message, my friend can see it and will be waiting for my reply. I think this function is the worst point of Kakaotalk.All of things have advantage and disadvantage at the same time. So I think we should using consider that and it is a duty of user.