The mobile app is not responding - who should I contact? NTUC Link Give us a shout-out via the Plus! app "Contact Us" button under "Account" page. Related articles How do I provide feedback and suggestions to improve the app? Plus! Visa Card - Card Pin, OCBC Phone Banking & Online Banking What is the Plus! app about? Can I use my phone like a Plus! card by tapping it in store? Where do I register for a login account?