How can I jailbreak without internet access on my device?

I bought an iPhone and it's in airplane mode with find my iPhone on. I want to jailbreak it and delete the icloud account but I'm sure as soon as I connect to a network, it'll trigger an erase or lost mode or something without enough time to verify the certificate for the jailbreak app and jailbreak. I need some way to install and use the app without having to verify it or somehow block the phone from contacting icloud and triggering the erase. I can't edit the hosts because it's not jailbroken. What is the exact site I would have to block?

LOL you fool. How are you going to sign out of the iCloud account without Internet? It doesn't work that way…

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