title: Get the user's approximate location without GPS / WiFi / Internet
body: <p>I'm trying to find a way of checking if the user is in the US, and do it somehow that it's instant. This means no GPS, and no internet. 
  I have a few ideas, but they're not as accurate as I'd want, so maybe someone here has some tricks up his/her sleeves.</p>
  
  <p>Thanks!</p>