There are a lot of social apps on Google Play store but a few of them are so amazing. Smart Whatsapp is one of them. You can use this app to change your dp. The app provides the function to send unlimited messages to any number in one click.
The app is very popular in UAE, Pakistan, Colombia, and Kenya. It is a free social app that requires android 4.0+ version. The latest version of the apk file is 3.0.2. NG Whatsapp is also the best option if you want some extra features.
The downloading process is also simple. You just have to download the APK file from the above button and install the app manually.