Question: what is the difference between iphone watch 3 and 4?
Answer: The one big difference between the Series 3 and the Series 4 is the chip inside. ... Both the Series 3 and the Series 4 have GPS and Cellular models, and both come with Wi-Fi. The Series 3 has Bluetooth 4.2, while the Series 4 has Bluetooth 5.0 which has lower power consumption and a slightly faster speeds.