Hold your iPhone near your Apple Watch until the Apple Watch pairing screen appears on your iPhone. Also tested on 21 Point Check System which includes functions like charging - LCD Touch - WIFI Bluetooth - Texting - Unlock Status and other Key Functions.
Very good, I love the 15, way better screen compared to my old one, buttery smooth animations, super bright outdoors, even the flash is brighter for at night in the dark! Battery life is good too, although i recommend going into the settings and changing show background to off in the always on section, which will grant you a lot more battery throughout the day. Also came in perfect condition, 100% battery health, gotta love it