Using a dummy credit card is a very dangerous practice that can cost you dearly. If you use a dummy credit card to make purchases, once the credit card company discovers this behavior, you may face high penalties and interest charges, or even be banned from using the credit card. In addition, using dummy credit cards can also hurt your credit score, which will seriously affect your future financial life.

Another consequence of using a dummy credit card is that you may be locked into debt with a high interest rate. If you fail to repay your credit card balance on time, you may be subject to high penalties and interest, adding to your financial burden. And if you carry unpaid credit card debt over a long period of time, they will add to your debt load and may adversely affect your credit score.

Finally, dummy credit cards can also become your identity theft risk. If you use a blank credit card to make online purchases or other transactions, your credit card information may be stolen by hackers. Once your credit card information is stolen, you may be exposed to credit card fraud or even lose your money and identity. Therefore, for your own safety and financial security, never use a blank credit card for any transactions.