If the card checker has an Android device, the smartcard can be accessed using technology called Near Field Communications (NFC). This reads the chip that is embedded in the smart card. The card checker does not need to be connected to the mobile network for this function to work in the field.
If the card checker has an Apple device or an Android without NFC, and the smartcard QR code has been scanned in an area that is connected to the mobile network, the information remains available in the memory cache of the phone. The RIW App displays the record that was last checked with the live database, but will automatically update records once the phone synchronises back to the server in an area with connectivity.