American carriers have a different protocol than the EU. The EU (and probably EU derived networks) uses a """secret""" SMS format that's opt-in, but the 911 system works differently.

The 911 feature can be activated fully remotely, the 112 feature is supposed to only activate when dialing an emergency number.

▲

yencabulator 14 hours ago | parent | next [-]

The US one is called E911: https://en.wikipedia.org/wiki/Enhanced_911

▲

gruez 13 hours ago | parent | prev | next [-]

>The 911 feature can be activated fully remotely

Source? Even if the phone isn't actively doing a 911 call?

	▲	Havoc 13 hours ago \| parent [-]
		GP likely means any 911 call automatically has geo tracing. >The dispatcher's computer receives information from the telephone company about the physical address (for landlines) or geographic coordinates (for wireless) of the caller.

▲

stavros 11 hours ago | parent | prev [-]

Wait wait, so if I know the "secret" SMS format I can text someone's phone and get their coordinates back?

▲

defer 10 hours ago | parent [-]

No, the SMS is initiated by the device upon calling emergency, not requested by the emergency service. The standard is called AML.

The format is not secret either, it's just binary encoded.

	▲	stavros 9 hours ago \| parent [-]
		Ahh OK, well that just sounds reasonable.