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Customer Support

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Device or Bank Related Queries

Please contact your bank or device manufacturer via telephone, web, or your bank’s mobile application.

Need Help One OS the mobile app?

Please email or call customer service at:

Need help with One OS Mastercard account?

Toll-Free Customer Service Number:

Please contact your bank or device manufacturer via telephone, web, or your bank’s mobile application.

For OneOS account and app enquiries

Please email our customer service at:

For wallet account (OneCard) enquiries

Toll-Free Customer Service Number:

International Customer Service Number:

The One OS Mastercard is issued by Sunrise Banks N.A., Member FDIC, pursuant to a license from Mastercard International Incorporated. Mastercard is a registered trademark, and the circles design is a trademark of Mastercard International Incorporated. This card may be used everywhere Debit Mastercard is accepted. Use of this card constitutes acceptance of the terms and conditions stated in the Cardholder Agreement. Card program marketed and administered by Usio Inc., an Independent Sales Organization (ISO) pursuant to an agreement with Sunrise Banks, N.A.