Is it possible to implement bank account number portability in banking industry just like telecommunication and pension system examples? In a mobile world where the customer behaviors and demands are changing rapidly, the idea of account number portability in banking industry, comparing with the aggressive competition in telco and pension industries, must be discussed as well. Account number portability in banking will have a huge impact on many business headlines. Risk management, money laundering, fraud, loans, cards, automated bill payments, deposit insurance, clearing and switching mechanism and its governance, competition law and capital accord should be examined. Within this conceptual and hypothetical study, the fundamental principles and requirements as well as countries case studies are highlighted and account number portability in Turkey is discussed. The basic and critical needs are proposed for account number portability in order to be a guideline for academic works and professional initiatives in the banking industry, in the future.Keywords: Bank account number portability, customer experience, bank account switching, mobile financial services, operational efficiency.JEL Classification: G20,G21,G23