Crossing Lines
A practical guide to protecting your iPhone at international borders.
A seven-part series on border device searches: the legal landscape, what forensic tools actually do, how to prepare your iPhone, what to do when asked to unlock, and how to handle the return trip. Grounded in CBP statistics, federal court opinions, forensic-tool vendor documentation, and guidance from EFF, CPJ, Access Now, and university research-security offices.
- Part 1
Your Phone Is the Most Searchable Thing You Carry
Border crossings are a legal space unlike anywhere else in modern life. A grounded look at how many device searches happen, what authority enables them, and why it matters for ordinary travelers.
7 min read
- Part 2
What Actually Happens When a Border Agent Searches Your Phone
The three meaningfully different things that can happen to your phone at a border crossing — manual inspection, forensic extraction, and cloud-cache exposure — and the single most important technical fact: Before First Unlock state.
7 min read
- Part 3
The Clean Phone Strategy — And When It Actually Makes Sense
Three approaches to border-crossing preparation — dedicated travel device, strip-and-restore, and the vault approach — with the honest tradeoffs of each.
6 min read
- Part 4
"Unlock Your Phone." What Do You Do?
The coerced-access scenario, what the law actually allows by citizenship status, and how duress modes and dead man's switches work in practice.
7 min read
- Part 5
It's Not Your Photos You Should Worry About
A pre-travel audit guide. The data categories most professionals overlook — contacts, cloud caches, email databases, notes, location artifacts — and what to do about each.
7 min read
- Part 6
Don't Forget the Return Trip
Re-entry is often the higher-risk crossing. What to do if your device is seized, how to treat a returned phone, and the post-incident response that actually matters.
6 min read
- Part 7
Your Complete Border-Crossing Checklist
Everything in the Crossing Lines series, consolidated into a working checklist you can save and reference before every international trip.
9 min read
Built for this threat model
UltraLocked is a Secure Enclave-anchored file vault for iPhone — no cloud sync, no account, no server. Duress codes, dead man's switch, and metadata sanitization are built in. If you cross borders with sensitive files, see how it works on the secure travel vault page.
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