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'''Phone sensors''' are the part of modern smartphones, with most phones having at least an accelerometer, GPS, video camera and microphone. More expensive models can also include more weather sensors. This should make a great and "free" source of data but getting any of the many apps to work right can turn out to be difficult. There are a variety of apps and build-in tools for collecting sensor data from phones.  

'''Phone sensors''' are the part of modern smartphones, with most phones having at least an accelerometer, GPS, video camera and microphone. More expensive models can also include more weather sensors. This should make a great and "free" source of data but getting any of the many apps to work right can turn out to be difficult. There are a variety of apps and build-in tools for collecting sensor data from phones.