WhatsApp Messenger is a cross-platform smartphone messenger currently available for iPhone, Android, BlackBerry and Nokia phones. The application utilizes push notifications to instantly get messages from friends, colleagues and family.
Simply install and when you receive a WhatsApp message you can reply from anywhere (lock screen, home screen etc) using the Quick Reply pop-up window. It works seamlessly, it's convenient and quick. Give it a try today!
You can see a screenshot of the Quick Reply box below. You can purchase WhatsApp Messenger from the App Store for $0.99 and a free 7 day trial of Quick Reply for WhatsApp can be downloaded from the BigBoss Cydia Repository.