其他隐秘的功能包括阻止来电，电邮或闹钟，关闭手机背景灯和背景拍摄等等。
Stealthy functions include blocking incoming calls, emails & other alerts, turning off your backlight and background shooting.
技术局限性实例可能包括：要是你想创建一个能阻止特定来电的应用程序会怎么样呢？
Examples of technical limitations might include: What if you wanted to create an app that would allow you to block calls from a specific number?
未登记号码、来电提示和黑名单都曾试图解决这个问题，但仍然阻止不了你不想接到的来电。
Unlisted Numbers, Caller ID and do-not-call lists all tried to solve this problem, but these solutions still don't prevent unwanted calls.
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