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A fake number will work for sites that store credit card information to either charge you later or ask you to upgrade.

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 generate and validate credit card numbers directly from the app, making it easy to use on the go as well.

Validation in particular would be useful if you were accepting credit card payments on your own site and wanted to make sure the cards were legit.