Your mobile phone is giving away your approximate location all day long. AT&T, Sprint, T-Mobile and Verizon are selling this location information to third party companies without your consent or a court order. As long as anyone but law enforcement agencies with a valid court order can access this data, it is always going to be at extremely high risk of being hacked, stolen and misused. The New York Times reported a little-known data broker named Securus was selling local police forces around the country the ability to look up the precise location of any cell phone across all of the major U.S. mobile networks.”]
Source: https://krebsonsecurity.com/2018/05/mobile-giants-please-dont-share-the-where/