With the increasing reports of people receiving anti-phishing calls from Hong Kong after answering calls from +86 mobile numbers, it's natural to question whether using non-mainland mobile numbers as contact information for bank services is a viable option. Despite the concerns, it's essential to clarify the regulations and security measures in place to ensure a safe and reliable banking experience.

Mainland China has implemented stringent regulations to prevent financial fraud and protect customer information. Banks and financial institutions are required to adhere to these regulations, which include verifying customer identities and ensuring the security of customer data.

When it comes to using non-mainland mobile numbers as contact information, it's crucial to understand that banks may still require additional verification steps to comply with anti-money laundering and combating the financing of terrorism (AML/CFT) regulations.

In addition, many banks have implemented advanced security measures to prevent unauthorized access and reduce the risk of financial fraud. These measures include multi-factor authentication, encryption, and regular security audits.

In conclusion, while it's important to be cautious when using non-mainland mobile numbers as contact information for bank services, it's not entirely impossible. By understanding the regulations and security measures in place, individuals can make informed decisions about their financial transactions and protect their personal and financial information.