Yes, cell tower use doesn't give location. However some years back, (after rescue crews couldn't locate a driver who'd crashed into a ravine and was calling for help), the government mandated GPS location capabilities in cellphones, which are forwarded to the tower as part of the logon protocol. Even if you're not using the phone, the cell company can pinpoint your location and/or know that you're moving. Whether the location is determined via triangulation or GPS isn't relevant except to the phone and carrier. (and those who care or need to know about these things).