I will send my iPhone in for a repair via post to Apple. In the article about how to prepare the iPhone for shipping, nothing is said about the Apple Watch paired with it (https://support.apple.com/en-us/HT201557). I ask: do I need to unpair the Watch before sending? Or can I just erase the iPhone and still use Watch without it? And what do I have to do when the iPhone returns? Thanks for helping me.