Android: Settings > Wireless & Networks > (More) > NFC
Windows Phone: App list > Settings > Tap to share / Tap to pay > NFC
BlackBerry: Manage Connections > NFC
The consumption of the NFC sensor is almost irrelevant. In addition, it consumes battery only when it is in use, similar to GPS. This feature allows you to leave the NFC sensor enabled, no problems for the consumption of the battery.
NFC Tags work properly between -20° and 70° Celsius / between -4° and 158° Fahrenheit.
How far away does NFC work?
NFC operates in a frequency range centered on 13.56 MHz and offers a data transmission rate of up to 424 kbit/s within a distance of approximately 10 centimeters.