Abstract: A method capable of detecting a location and activities of smartphone application users by combining the use of Globally Unique Identifiers (GUID) and various physical sensor infrastructure technologies. GUID (or UUID) is also known as ‘Globally Unique Identifier’ or ‘Universally Unique Identifier’ which uses a 128-bit integer number to identify resources. The physical sensor infrastructure technology includes WiFi, iBeacon and/or Near Field Communications.