Offline mode allows you to save your digital card to your Wallet so it's always accessible — even without an internet connection. This way you can share your contact details anytime, anywhere, regardless of network availability.
To add your card to Wallet:
From the TAC app:
Log in to your profile
Tap "Card" in the top right corner
Tap "Add to Wallet"
Select "Offline"
Once your digital card has been generated, tap "Add" in the top right corner to save it to your Wallet