where can I look up the serial number to see when first sold?
Where do I go on Apple.com to look up the serial number of my iPhone to determine when it was first sold?
Question marked as
There is no place to do that. You can check if there is any warranty coverage here: https://checkcoverage.apple.com/. The warranty is good for 1 year, so if there is still coverage, it was sold within the last year.