手机号停用未解绑，微信里10万元差点没了！换号必做→

Core Viewpoint - The article highlights the risks associated with not unlinking old phone numbers from accounts, which can lead to unauthorized access and potential financial loss when the number is reassigned to someone else [1][4]. Group 1: Incident Overview - A case was reported where an individual lost access to their WeChat account containing 100,000 yuan due to their old phone number being reassigned after not being unlinked [1][2]. - The police were able to recover the account and funds after identifying the new user [2]. Group 2: Regulations and Risks - According to national telecommunications regulations, phone numbers can be reassigned 90 days after cancellation, referred to as "secondary numbers" [2][4]. - The practice of reassigning numbers is a common method to optimize communication resources but poses privacy and security risks if the original owner has not unlinked their accounts [4]. Group 3: User Guidance - Users can check if a new number is a "secondary number" through a service provided by major telecom operators and internet platforms, which allows for easy unbinding of previous account associations [6][10]. - It is recommended to prioritize unlinking important accounts, such as payment and social media, before canceling the old number [12]. Group 4: Security Measures - After unlinking and canceling a number, it is advised to physically destroy the SIM card to prevent unauthorized use [13]. - Old electronic devices should also be properly cleaned to avoid leaking personal information, including financial and work-related data [13]. Group 5: Final Recommendations - The article emphasizes a three-step process for changing phone numbers: query, unlink, and destroy, to safeguard personal information [15].