The Apple iPhone 6 is a single SIM ( GSM) smartphone that accepts a Nano-SIM. Connectivity options include Wi-Fi, GPS, Bluetooth, NFC, 3G and 4G ( with support for Band 40 used by some LTE networks in India) . Sensors on the phone include Compass Magnetometer, Proximity sensor, Accelerometer, Ambient light sensor, Gyroscope and Barometer