This was confirmed as untrue by several British police forces who publicly cited the dangers of making such calls.
[1][3] A related belief arose in 2015 that telling Siri on an iPhone to "Charge my phone to 100%" would cause the phone to call the emergency services as a secret safety code.
[6] These silent calls waste police time that could potentially block responses to real emergencies.
[7] Bedfordshire Police also released information asking people not to call 999 except for an emergency as they stated that in the last six months of 2013 they had an increase in hoax 999 calls from people believing the urban legend.
[8] Other sources supplemented these press releases by stating that misusing the 999 number is illegal.