The Apple Watch works best when used with the iPhone. But Apple Watch has also integrated some functions that can be used without a smartphone. Time, alarm clock, stopwatch and timer are just a few of the functions that you can use freely.
However, you can listen to music even if you don’t have an iPhone with you. Apple Watch allows you to save up to 2 GB. But you have to use a Bluetooth headset, because there is no way to use a headset with a jack plug on Apple Watch.
Photos can also be saved on Apple Watch. You have approximately 75 MB of internal memory available. Apple Pay also works without an iPhone, because Apple Watch enables this payment function without having to have your iPhone ready.