In order to use the PDCheck app with your smartphone you will need to meet the following requirements.
Apple iOS Smartphones: iOS 10.X or higher
Android Smartphones: Android OS 5.X or higher and 4GB of RAM
If your smartphone does not meet these requirements you will not be able to use the PDCheck app. If you have any questions to whether or not your smartphone is compatible, please contact firstname.lastname@example.org with further questions.