PhoneCash is an app powered by AI and Machine Learning. The app automatically runs an auto diagnosis engine which tests a smartphone’s Wifi, Bluetooth, GPS, Network, camera, flashlight, battery, touch, speaker, charging, face ID, fingerprint, volume button and others followed by self-evaluation of physical attributes of the phone through a questionnaire. Basis of the derived health score, the algorithm-based price engine discovers the best value for the old device and also offers customized upgrade options to the customers. The primary version of the app will enable consumers to sell or upgrade smartphones and going forward PhoneCash will connect customers to the nearest retail and online stores to sell and buy smartphones.