Question: is the apple watch series 3 compatible with iphone 6

Answer: Yes, The third generation of the Apple Watch features a faster processor, the dual-core S3, Bluetooth 4.2 vs 4.0 on older models, a built-in altimeter for measuring flights of stairs climbed, increased RAM size, and is available in a variant with LTE cellular connectivity. Siri is able to speak on Apple Watch Series 3 due to the increased processing speed of the Watch. The Series 3 Apple Watch is explicitly not compatible with iPhone 5 devices, requiring users to have an iPhone 5S or later for the GPS-only model, or an iPhone 6 or later for the cellular-enabled model.