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this post was submitted on 06 Nov 2026
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With those resources you can get a custom SIM card for your custom tower (it's actually not super expensive for basic ass devices with some dozen meters range) and then fake absolutely everything, and it won't disrupt any real devices
Emergency calls ignore roaming settings and usually connect without checking subscription, no? Unless the SIM is so invalid the towers reject it explicitly. Or the phone is old and invalid, which is fucked up but a thing that's possible.
Almost forgot that the US doesn't have plain GSM anymore though, so there's that.
Emergency calls will go to your own carrier first, but if you have no SIM your phone will attempt to connect to any available carrier arbitrarily which offers emergency services and that carrier will accept the emergency call
That's why faking your own carrier with your own basestation and using a custom SIM to make your phone use it would prevent real emergency calls. (beware, doing it to others' phones is very illegal)