iPhone users should be wary of this one Siri command

Emergency Call displayed on an iPhone.
CNBC / Eric Wilkens

Some iPhone users are scratching their heads over an unusual Siri phenomenon that takes place when commanding the technological assistant to charge their phone.

Saying the words "charge my phone 100 percent" will prompt their devices to give them a five-second window before automatically calling emergency services, The Verge reported.

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While this unusual function could lead to many mistaken emergency phone calls, it also has the potential to be a discreet method of calling the police in the event of a home invasion or kidnapping.

Many iPhone users have taken to social media after coming across this function:

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It is unclear whether this feature was introduced intentionally by Apple or is simply a software glitch. Apple did not immediately reply to a request for comment.

The strange feature appears to works on both iOS 8 and iOS 9, according to multiple experiments conducted by CNBC.

Correction: This story has been updated to reflect the correct news outlet that discovered the glitch.