When I see the words "free trial," I know I'm probably going to have to whip out my credit card and enter in the number to "not get charged." Then I end up forgetting about the trial and want to kick myself in the ass when I see my statement at the end of the month. For that to work, you would need a valid expiration date and CVV or CSV number.
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Now, to be completely clear, these numbers cannot be used to purchase any item. The credit card number generator uses a system based off of the Luhn Algorithm, which has been used to validate numbers for decades.
You can learn more about the algorithm on their webpage, or check out the Null Byte guide on how credit card algorithms work.
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.
There's also an Android application for getting fake card numbers called Card Gen, available for free in the Play Store.
Through their website you can find plenty of information and advice, including ‘How To’ guides and cardholder agreement details.