Yes, Citibank provides 24/7 customer service. You can contact their customer service team at any time via phone for assistance with a wide range of banking needs, including account inquiries, lost or stolen cards, and online banking issues. Additionally, Citibank offers support through their mobile app and website, featuring live chat options and a comprehensive help center. Whether you need help with transactions, technical issues, or general questions, Citibank’s around-the-clock service ensures you have access to the support you need whenever you need it.