In this video tutorial, we will develop an android messaging app we will design the app interface that how it looks to end user and we will set a feature of contact picker. Contact Picker is a useful feature in MIT App Inventor 2, with it a user can pick up the contact from its device contacts and the app automatically go through all the permission of like Read, Write. We just set up the logic of how the app can send the message and we also set a restriction of Numbers Only on the Phone edit text. We also set the hints for the facility of the end user and to differentiate between the messaging section and the phone section.