Affordable mobile technologies are introducing newer communication possibilities to the smart phone users everyday. Considering the impact of this incredibly popular mobile technology on the users, an android application named “Doctor who?” has been designed and developed, which makes an easy and effective communications with the users to the doctors and hospitals. Using this app, patients can make appointment with doctors of different specialties in different locations and can take help for a 24/7 online medical consultancy and emergency ambulance service. This application will also provide users a list of registered blood donors with contact details for all existing blood groups. Most importantly, this free and customizable app helps both the patients and doctors to update their information creating a database where profile of doctors and patients can be stored. The usability and effectiveness of this android application have been evaluated assuring friendliness and customization capability based on user's need. The practical result shows that the proposed application is highly promising for different types of users, which help them to maintain a proper health care.