The 1-888 Vault-Tec phone number seen in Fallout 4 works.

The phone number of Vault-Tec, the fictional in-game company that built the vault your character emerges out of, is actually a functioning number you can dial in real-life.

The 1-888-4-VAULT-TEC number may look a bit longer than most, but it does work, as Polygon discovered.

This number was available in Fallout 3, and you see it in Fallout 4 on a Vault-Tec poster in the house at the beginning of the game. Here’s what happens when you call it.

For more Fallout 4 news, Easter eggs, tips and more, our hub will be all you need.