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Don't worry. They'll be permitted to compel you to restore your backup soon enough.

How often are you having to hand over your phone to customs? I've literally never been asked to do so.

You could fake the welcome/configuration screen too (maybe with a jailbreak tweak) if they completely overlook phones that display it.

Don’t do that. Just wipe it and restore it properly. “Faking” the welcome screen first of all means your data is accessible if they do decide to look closer. And secondly it’ll probably lead to some additional questions meaning that more of your time is wasted at the airport.

It's also illegal to lie to a boarder agent, and that would probably include this.