Do I need to do this for a smartphone?

Generally, no. Custom officials expect travelers to have a personal phone. Focus on specialized gear like lenses, drones, or high-end watches.

What if I can't find a customs office at the airport?

Visit a local Customs and Border Protection port office in your city during business hours a few days before your trip. You do not have to do this on the day of travel.

Will this help if my gear is stolen?

No. This form is strictly for avoiding import duties. You will still need to file a police report and contact your insurance provider if your gear is stolen.

How to navigate customs with high-value gear

To avoid paying import taxes on your own property, you must prove you owned the items before leaving your home country. Use a CBP Form 4457 (or your country's equivalent) to register your high-value items with customs officials before you depart.

Inventory your items. Make a list of every item worth over $500, such as professional cameras, laptops, or jewelry. Include the brand, model, and serial number for each.
Visit the customs office. Arrive at the airport 2 hours earlier than usual. Go to the Customs and Border Protection (CBP) office—not the security checkpoint—before you pass through TSA.
Complete Form 4457. Present the items to the officer. They will inspect the serial numbers, verify your ownership, and sign/stamp your Form 4457. Keep this paper in your carry-on for the duration of your trip.
Declare upon return. If questioned upon re-entry, present the stamped form to the customs officer to prove the items were exported from your home country and are not new foreign purchases.

Do I need to do this for a smartphone?: Generally, no. Custom officials expect travelers to have a personal phone. Focus on specialized gear like lenses, drones, or high-end watches.
What if I can't find a customs office at the airport?: Visit a local Customs and Border Protection port office in your city during business hours a few days before your trip. You do not have to do this on the day of travel.
Will this help if my gear is stolen?: No. This form is strictly for avoiding import duties. You will still need to file a police report and contact your insurance provider if your gear is stolen.