These are NEW condition and come in a sealed retail box. 

They are subject to the US Reseller Flex Policy, also known as SIM OUT. This policy allows retail stores to sell devices that have not yet been locked for use on a specific US cell carrier. However, these devices are programmed to lock to the first US carrier they connect to after inserting a compatible SIM card. If you want to switch carriers later, you must request that your original carrier unlock the phone. 

To use internationally, you must first set them up with a US carrier and then request that they unlock the phone.