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.
You'd rather get a good job and apply for a real credit card.
Dis Card verifies and generates credit card numbers.
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Carding is a very risky business, and there's not such a thing as free money.
The issuer for the card you selected determines whether a credit card application gets approved or denied.
Response time generally depends on the applicant's credit history.
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.