Get unlimited free trials using fake credit card numbers. But before we should know that how credit card numbers are generated using Luhn Algorithm. A fake generated credit card number will work for sites that store credit card information to either charge you later or ask you to upgrade.

In order to avoid that rigmarole, you can actually use fake credit numbers instead of your own, and you can do that using the site getcreditcardnumbers.com, which can generate up to 9,999 credit card numbers at a time, or just one.

For sites that ask for an upfront fee or have an automatic charge sometime down the line (Hulu Plus, Netflix, Spotify), this won’t work since they ask for more than just a credit card number for validation. You can, however, get unlimited free trials on those sites using a simple trick with your email address if you have a valid card number with expiration date and CSV.