I’ve never had an Apple Watch before and I’m considering getting one, but I have some questions. If I get the WiFi only version and I go to my gym with WiFi, can I still leave my phone in my locker and get my iPhone notifications and access WiFi on the Apple Watch? Can I listen to Spotify on the Apple Watch? If yes, can I play it to Bluetooth headphones from the watch? Are there any sleep tracking apps for Apple Watch? Thank you!