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Bluetooth Magnetometer 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 magnetometer service allows another device such as a smartphone to wirelessly receive data from the micro:bit's magnetometer. The magnetometer measures the strength and direction of magnetic fields including the earth's and so it can be used as a digital compass and indicate the way the micro:bit is pointing relative to magnetic north.
Using the Bluetooth magnetometer service you could, for example, create a smartphone application which displays your direction of travel, updating it in real time.
No additional code is needed on the micro:bit to use the Bluetooth magnetometer service from another device.
bluetooth.startMagnetometerService();
Example: Starting the Bluetooth magnetometer service
The following code shows the Bluetooth magnetometer service being started:
bluetooth.startMagnetometerService();
Video - Magnetometer service demo
http://www.youtube.com/watch?v=C_0VL4Gp4_U
Advanced
For more advanced information on the micro:bit Bluetooth magnetometer 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