Barcode Scanning for ticket check-in is available on the Front-End using a Password Protected Private Page similar to this Page. It is also available in the ADMIN Back-Office.
The functionality supports most common barcode scanners and many iPhones and Android Phones.
For SmartPhones we recommend using these free apps:
For iPhones (iOS) we recommend EE4 Apple App
For Android Phones we recommend EE4 Android App