Before we begin, we must emphasize a few prerequisites. Obviously, you have to own both an Apple Watch and an iPhone, and have the same iCloud account associated with them. Additionally, Bluetooth and Wi-Fi must be enabled on both devices. However, you don't have to be connected to a Wi-Fi network. The two Apple devices must also be in close proximity.
Personally, I'm a big fan of this feature because I just unlock my iPhone with Face ID when I put the watch on. I don't need to enter any passwords on either device. The process is seamless and eliminates the need for you to manually enter your PIN on the Apple Watch's small screen. If you take your watch off often and don't really have to worry about anyone snooping on your smartwatch, this handy setting will save you a few seconds every time you put your watch back on. If your iPhone is moved away from your watch, the setting won't trigger, so your watch remains protected from bad actors.
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