Inclusion Criteria:  Aged ≥65 years, Having Hong Kong ID Chinese speaking Willing to be followed up by telephone Having a smartphone Have not received seasonal influenza vaccination for the incoming flu season  Exclusion Criteria:  Cognitive impairment, blindness or deafness, Not able to communicate with others effectively With known contradictions of seasonal influenza vaccination listed by the Centre for Health Protection (allergic to previous SIV, diagnosed/suspected egg allergy, with bleeding disorder or on warfarin)