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Bluetooth Accelerometer Service
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For another device like a smartphone to use any of the Bluetooth "services" which the micro:bit has, it must first connect to the micro:bit.
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The Bluetooth accelerometer service allows another device such as a smartphone to wirelessly receive data from the micro:bit's accelerometer. An accelerometer detects motion. More precisely, it measures acceleration in one or more of three directions which we call X, Y and Z.
Using the Bluetooth accelerometer service you could, for example, create a smartphone application which makes a loud noise whenever your micro:bit (or the important thing you've attached it to) is moved. Or you could use your micro:bit to control the movement of a cartoon character in a game on your smartphone just by tilting the micro:bit in the direction you want the character to move in.
No additional code is needed on the micro:bit to use the Bluetooth accelerometer service from another device.
bluetooth.startAccelerometerService();
Example: Starting the Bluetooth accelerometer service
The following code shows the Bluetooth accelerometer service being started:
bluetooth.startAccelerometerService();
Video - Accelerometer service demo - Starts at 0:18
http://www.youtube.com/watch?v=aep_GVowKfs
Advanced
For more advanced information on the micro:bit Bluetooth accelerometer service including information on using a smartphone, see the Lancaster University micro:bit runtime technical documentation
See also
Bluetooth SIG, Bluetooth on micro:bit resources
microbit-bluetooth