The hobbyists being the communication networks, tracing your phone location? I guess this has been tried before: http://www.zeit.de/datenschutz/malte-spitz-dat

The hobbyists being the communication networks, tracing your phone location? I guess this has been tried before: http://www.zeit.de/datenschutz/malte-spitz-data-retention http://www.zeit.de/datenschutz/malte-spitz-data-retention