The mobile payment service, which offers instant money transfers via mobile phones, will initially be offered to select new and existing Citi customers as part of a limited consumer trial in Chicago.

For this trial, we are working with Obopay to address our customers’ emerging lifestyle needs and support them in accessing their money in a fast, convenient, and secure manner through something they always have with them – their mobile phones, said Darryl Hendricks, president of Citibank Illinois.

Citi customers participating in the trial can open and add money to this new mobile payment account via a special website, by credit card or by an electronic bank transfer. Then, using the Obopay mobile application, their mobile web browser, or text messaging, Citi customers can manage this account directly from their mobile phone.

Trial participants will be able to check account balances, view payment histories, and add funds to their mobile payment account. Funds in the Citi Obopay account can also be used through a companion debit card that enables cash withdrawals from ATMs or payment at any store or merchant that accepts MasterCard.