Core Viewpoint - The article discusses the upgrade of the "second number" service in China, allowing users to unlink their previous accounts from over 200 popular apps after acquiring a recycled phone number [1][2]. Group 1: Service Upgrade - The "second number" service has been upgraded to support one-click unbinding for over 200 commonly used internet applications, including WeChat, Douyin, Taobao, Meituan, Alipay, and JD.com [1]. - Users can submit unbinding requests, which are typically processed within five days by internet companies [1]. Group 2: Proactive Measures - Several telecom operators have initiated a "proactive renewal" bulk unbinding service to reduce risks associated with "second numbers" [2]. - China Mobile will push notifications to internet application providers about recycled numbers before they are reissued, ensuring unbinding is completed beforehand [2]. - China Unicom will also bulk解除前任机主与互联网账号的历史绑定关系 for numbers ready to be reissued, ensuring that the recycled numbers are "clean" [2]. Group 3: Limitations of the Service - The "second number" service only applies to unbinding accounts linked to previous users; current users must contact the internet application providers directly for their own unbinding needs [3].