Using the ESRI Survey123 PSCIS Mobile App for Apple and Android Devices. Use your phone or tablet to capture your field data electronically and avoid the excel template altogether. Data validation and photo capture is built into the app, so it is more straightforward than the original method. Data is still submitted via ESF at the final stage. For further guidance, please see the Instructions on How to Download and Use the PSCIS S123 Mobile App (PDF, 2.6MB)