"Virtual" and/or "prepaid" credit Cards

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From citi's FAQ:

Virtual Account Numbers are available on:
AT&T Universal Savings Platinum Card
AT&T Universal Savings Rewards Card
Citi® Bronze / AAdvantage® MasterCard®
Citi® Bronze / AAdvantage® MasterCard® for College Students
Citi CashReturns® MasterCard
Citi® Diamond Preferred® Card
Citi® Diamond Preferred® Rewards Card
Citi® Dividend Platinum Select® Visa® Card for College Students
Citi® Dividend Platinum Select® MasterCard® for College Students
Citi® Gold / AAdvantage® World MasterCard®
Citi® mtvUTM Platinum Select® Visa® Card for College Students
Citi® Platinum Select® / AAdvantage® World MasterCard®
Citi® Platinum Select® MasterCard®
Citi® Platinum Select® Visa® Card for College Students
Citi® Platinum Select® MasterCard® for College Students
Citi PremierPass® Card
Citi PremierPass® Card - Elite Level
Citi PremierPass® Expedia.com Card
Citi PremierPass® Expedia.com Card - Elite Level
Citi® Secured MasterCard®