Do I need to unlock my phone before I travel?
Do I need to unlock my phone before I travel? Unlock Your Phone Before you can swap out your SIM card, make sure to “unlock” your mobile phone so it can work in the foreign country's wireless network. An unlocked phone isn't tied to a specific mobile carrier and will work with any carrier that uses the same wireless network.
Can you refuse to unlock your phone at airport?
U.S. citizens cannot be denied entry to the United States for refusing to provide passwords or unlocking devices. Refusal to do so might lead to delay, additional questioning, and/or officers seizing your device for further inspection.