Of course it does. You are not on a US cellular carrier. Non-US carriers went with a different system to accomplish the same goal.
Let me point something out for everyone following along. The US invented the baseline phone system (POTS). It added features to the system at the PBX level so that regular users had no access to them unless access was paid for. IE Telcos where using tone based commands at the operator level two decades before touch tone dialing was main stream for the US. Heck the US allowed CDMA to be implemented even though GSM was superior. Come on, if that isn't the single largest clue that the US FCC are idiots, nothing will convince you.
So yes folks, every cellular provider can do things differently. But Verizon has a very strict setup and the iOS devices on them follow a very strict set of rules. Hence why I posted they should call *611.
BTW I am still waiting to see the result of that phone call to Verizon. Which at present is the only way to resolve this issue, that I am aware of.