Most smartphones with an iOS (Apple) or Android operating system should work. If the phone is too old to be updated to the most current version of the operating system it will be at risk of being incompatible with the KnowYourDrive app. The phone must have proper sensors, which may include a gyroscope and accelerometer. On average, the app uses 60-70 megabytes of data per month, though this varies depending on the actual driving time.