A fake number would be rejected out of hand. In addition, the billing address is checked. This, again, will fail, as there is nothing to check against. If, however, the payment processing system are offline, the site may choose to accept any valid-looking card.
Can u go to jail for using a fake credit card?
Credit card fraud that involves the theft of the card or the number typically has a prison sentence of 1 to 5 years. Identity theft is treated much more harshly with prison sentences up to 10 or 20 years.