Whooapp is a free messenger plus caller ID app that keeps you connected to anyone in the world through your Internet connection. You can send a text message to friends and family and also you can notify person you are calling what subject of your call.

Connect with friends and family using instant messaging plus much more
Chat with a contact from your phone book or simply enter a new phone number. You can send a text message, but also you can even send files.

Caller ID
You are getting lots of call from caller that you don’t have in your phonebook? We have every day growing database with caller data so whooApp will display name of caller even if you don’t have caller number stored in your phonebook

https://play.google.com/store/apps/details?id=com.saan.whooapp