Voice and video calls can work over cellular data or Wi-Fi so you can always make calls if necessary, but you will have to watch your carrier data caps.
Since its change, imo is another chat app looking for an audience.
In many ways, Google already managed the "best" video chat service with Hangouts.
As a highly functional group video service and a fantastic mobile solution for person-to-person video chat, Hangouts is great as long as everyone using the service is fairly technically minded.
The act of communicating in real time through video hasn't really changed in nearly 20 years.
Two devices with the same software initiate a connection, you wait for the video to load, and if you're lucky the connection is good enough for a conversation to happen at a close to real world cadence.
Some things you can do are, chat in groups using chat rooms, create your own free chat rooms, share your precious photos, make friends, build your friends list, message people with wap chat messenger PM, chat with smileys and so much more. strives to give users the best user experience possible, so we therefore keep active, and in touch with the mobile chat community!