A lot of the time it won't lead to anything, as they're often fake, but sometimes production companies will set it up so that when you call the number you're met with a fun, in-world message.
If you want to call it for yourself first, then don't look at the video in the tweet above, or read on. For those of you who don't want to risk some potential annoying hidden fee or just can't be bothered, when you call up the number you're met with the lovely tones of a man screaming for several seconds before it just hangs up on you.
It's obviously not the kind of message you'd want to receive if you lived within the world of Fallout, but given the whole nuclear devastation thing, it makes sense in our world.
The Fallout show has seen a lot of players jumping back into the games, with Fallout 76 even hitting a new concurrent player count peak record.
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