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Aaaaand with the bootloader unlocked, they'll just grab the Cellebrite and/or call up Cellebrite Professional Services for remote unlock assistance.

https://cellebrite.com/en/advanced-services/

The biggest thing is to set your device up on arrival to be powered OFF. Most of Cellebrite (and other security vendors) solutions rely on the phone having been unlocked once since first poweron (or "AFU").

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Cellebrite has an extra column for GrapheneOS, as they seemingly can't unlock it (since ~2 years), compared to all other Android OEM Flavours.

And with GrapheneOS you can relock the bootloader, once you've installed it.

Source:

https://news.ycombinator.com/item?id=41072905

https://discuss.grapheneos.org/d/14344-cellebrite-premium-ju...

Even better would be to not even bring a phone in the first place, and get a temporary one after arrival. Or get a prepaid one beforehand with nothing on it, if you're confident that won't be suspicious.

Better at what? Painting yourself into a corner if something goes wrong and you don't have any local contacts that can help you?

Better at not having vulnerable data accessible to anyone that doesn't need it.

A new prepaid phone is what, $100? Sticky notes are essentially free.

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