If you are trying to check your own device and Apple says "Invalid," try these steps:
You cannot perform an requires without the number. Here is where to find it: apple serial number check apple
: If genuine, Apple will display the specific model name, purchase date, and current warranty or AppleCare status. Why You Should Check Your Serial Number If you are trying to check your own
Apple serial numbers encode model, production year/week, factory, and configuration. Decoding can indicate: and configuration. Decoding can indicate: