Android phones, apps and tablets

(Edit)

Bear in mind... telcos have always known all of this, and the police could always get access to it. All that Google have done is to give you access to your own data so that it is of utility and value to you. Turning it off in no way reduces the ability for third parties to get the information out of the telcos.

They telco's and the coppers (if they paid for it) had access to which cell tower(s) you were connected to, and if you logged into specific WiFi access points, but they've not had "to the nearest three metres" GPS coordinates for you- that's a difference surely?

Also the info was generally historical rather than real time.

Not that I really care, to be honest, but it's worth noting that Google increasingly allows us to give up information about ourselves that was either unobtainable, innacurate and/or very expensive to obtain previously.