It is an essential part of managing the land - and is controlled by a strict code and within a window of time before birds start to nest.

BBC: 'If you drop a match, it just goes'

The app displays a warning window each time a malicious USSD code is found, blocking the execution of the command.

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Chief Justice John Roberts asked the city's lawyer how long he needs to switch off his trigger lock (which requires entering a three-digit code) when a criminal is climbing through the window.

ECONOMIST: The Supreme Court hears a crucial case