Eh, while I don't think it's completely out of the realm of possibility that these two don't have any means of electronic communication to work with, in my opinion, it's a little implausible for a couple of reasons.
I acknowledge the point that yes, they're poor, etc. etc. but let's be fair, here. Having absolutely zero means of getting in touch with someone beyond showing up at their doorstep is just... unwise. So what we're arguing here is that if a situation should arise where "Hey, your family member was just hit by a bus and they're lying in a hospital somewhere," there's no reliable way to get this information short of having a uniformed officer make a visit to the squalid apartment where these two unaccompanied minors are living by themselves without any form of adult supervision whatsoever?
Sure, you make concessions for fiction, but well... right, as we're seeing in the thread, some folks are having a little trouble with suspension of disbelief.
Now I've never lived abroad, so I can't speak to what it's like in other countries, but at the very least, mobile phone carriers here in the U.S. allow phones on their networks to place outgoing emergency calls even if you don't have active service. i.e. you may not be paying for a plan, but you can still call 911. And no, that's not immediately relevant to the situation we're discussing here, but my point being that if only for those kinds of emergencies, it's good to have something. Having some means of contact with the rest of the world is not quite the luxury people are making it out to be, nor is it as impossible to secure access to those things as people are making it out to be.