First try to understand why you get conflicting signature error while installing Whats App+ on your Android phone or tablet.
Joy: My Brother Robert send me a link to install WhatsApp+ the pro & better version of Whats App to my mobile. The source link was APK file and I quickly downloaded it and while try to install the APK file I encountered this error – Application Not Installed with description as An existing package by the same name with a conflicting signature is already installed. I ensured “Install Apps from Unknown sources” is also ticked in Settings. I repeated the steps again and still my Karbonn A25+ throws up the same error. Robert can you help me resolve this error or explain us why this happens.
Solution:
Step I:-
Open What App and go menu >> Setting
Step II :-
After That Click Chat Setting. Make Backup of your Conversation.
Step III:-
After make Backup Whats app Conversation, now uninstall Whats App.
Now Your Mobile ready to install Whats App +. Install and chat with your friends.
(If you are Pro Android user and known commands, you can do it by using ADB Shell.)