There are instances when Citi gives existing cardholders the option to upgrade to other cards through targeted offers sent via email. In this case, you may complete the process online. If you're wondering how to upgrade a Citi credit card on your own, you need to call the number on the back of your card. If you're outside of the country, you may call collect at 605-335-2222.
People who feel their existing Citi credit cards come with poor reward rates or not enough perks may consider opting for upgrades. If you, on the other hand, don't use your card's perks enough to justify its annual fee, a downgrade might be in order. Typically, you may qualify for an upgrade after using your card for at least a year, although some cardholders may receive upgrades even earlier.
If you have a co-branded rewards card from Citi, it might make sense to upgrade or downgrade to a card linked to the same program, as this would let you hang on to your rewards. For example, if you have the no-annual-fee American Airlines AAdvantage MileUp Mastercard and wish to take advantage of more airline-specific benefits, upgrading to the Citi / AAdvantage Platinum Select World Elite Mastercard might work well for you.