Offline -- If the clover system is off line it should automatically ask for a contact number.
Its great that clover will still collect payment information to charge when it goes back online -- but if it turns on the card didn't work for some reason then you're out of luck.
Please have it so that if someone is choosing the credit card option while the system is offline that contact information must be entered in order to complete the transaction.
This feature is under review.
Suzanne Machczynski commented
Need my clover online payment