Contact One OS
Customer Support
We're Here to Help!
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:
Device or bank related enquiries
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: