 The purpose of this study is to assess the use of a mobile health intervention to improve adherence to asthma medication among adolescents. The intervention consists of an inhaler sensor strap to monitor asthma inhaler use and a mobile phone application to remind and incentivize patients to use their medication. This study will assess medication use throughout a 12 week study in patients who receive a mobile app with reminders, asthma control as measured by the ACT asthma control test, and lung function as measured by spirometry. 