猿大侠·2025-08-29 04:12Core Viewpoint - Recent reports indicate that users of China Mobile have begun to see advertisements in their signal bars, which has raised questions about compliance and user experience [3][8][21]. Group 1: User Experience - Many users have expressed mixed feelings about the new advertisement feature, with some finding it innovative while others feel disturbed by the unsolicited information [8][21]. - The advertisements displayed vary by region, showcasing local promotions and messages [4][5]. Group 2: Technical Background - The display of the operator's name in the status bar is governed by PLMN (Public Land Mobile Network) coding, which includes a unique combination of Mobile Country Code (MCC) and Mobile Network Code (MNC) [9][12]. - The PLMN Name can be derived from three sources: stored data in the mobile device, NITZ protocol broadcasts from the operator's base station, and information stored on the USIM card [13][14]. Group 3: Regulatory Changes - China Mobile and China Broadcasting have updated their requirements for mobile manufacturers, mandating the display of customized logos and NITZ messages in the operator's name position [15][19]. - The implementation timeline requires that all new devices from July 1, 2023, must support these features, with a full rollout expected by 2025 [17][18]. Group 4: User Concerns - Users are concerned that the ability of operators to modify NITZ messages could lead to an increase in advertising content in the status bar [21]. - While Android users can customize their operator names, iPhone users face significant barriers, as changing the status bar requires jailbreaking the device [21].