If a non-U.S. citizen's telephone number is not requested, what must be obtained instead?

When a non-U.S. citizen's telephone number is not requested, the next fundamental piece of information that must be obtained is their current address. This requirement aligns with regulations that emphasize identifying an individual's location for purposes such as ensuring compliance with legal obligations and facilitating communication.

Obtaining a current address is essential for various reasons, including monitoring for updates in residency status, sending official documents, and adhering to Know Your Customer (KYC) regulations. The address provides a means for financial institutions and regulatory bodies to verify identity and ensure accurate record keeping, which is particularly important in the context of compliance with anti-money laundering laws.

While other options like a Social Security number, date of birth, and occupation are important for establishing identity and assessing suitability for certain services, they do not serve the same fundamental purpose as a residence address in the context of identity verification and legal compliance for non-U.S. citizens.