All smart phones updated with current software are compatible using the camera to scan the QR code on your Mobilo Card.
Others are also compatible with the "tap" feature if they have NFC chip/functionality.
You can find a full list of compatibility here: http://mobilocard.com/support/.
Just scroll down a bit to the page heading, "Compatibility."
Older iPhones are now compatible with the NFC tap functionality by downloading the latest software version (iOS 14.0.1). After you download the software you'll need to access your command screen by swiping down on your home screen and select the NFC reader icon.