There are a lot of mobile applications out there that are readily available and are absolutely free that enables users to send messages and call people through the use of the wifi connection. Truthfully, I have used Viber, Kakaotalk and Whatsapp. I used to be a viber fan but nowadays, I use Kakaotalk more. Though it eats a lot of phone memory, I still prefer to use it and here's why:
Cute Emoticons and Themes. Kakaotalk is an explosion of cuteness. There are numerous cute and unique emoticons and themes available over at the store and some of them are being offered for free. Discover the fun in conversing different images!
Smooth Operation. Kakaotalk takes a lot of memory simply because it has a lot of functions. You can send voice recordings, animations, and pictures sing the application. The great thing about it is that these various features are actually working.
I'm loving Kakaotalk right now and I think that it is the best application so far if you want free messages and calls to other people.