Governments, law enforcement and intelligence services use mobiles to perform surveillance in the UK and the U.S. They possess technology to activate the microphones in cell phones remotely in order to listen to conversations that take place near to the person who holds the phone.
Mobile phones are also commonly used to collect location data. While the phone is turned on, the geographical location of a mobile phone can be determined easily (whether it is being used or not), using a technique known multilateration to calculate the differences in time for a signal to travel from the cell phone to each of several cell towers near the owner of the phones.
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