Concept : you can chat with your friends with ease here as it’s just great and very helpful .
Layout and design : friends it is a app of less then 5 mb so don’t expect outstanding graphics and designing but it’s also not so awkward.
Features and functions : you are getting almost every feature in this and you can also chat with your friends without messenger.
Usefulness : great use as you are not overloading your phone and you are getting everything which you would expect.
Thanks.