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Ask HN: How does uber automatically log me in after I redownload the app?

• gtirloni 10y ago
  It has USB media access and thus can edit your files. They probably choose not to delete that data during uninstall.
• symlinkk 10y ago
  if you sign in with your facebook / twitter account it uses the system-wide ios facebook / twitter credentials which aren't deleted when the app is removed
• devmgr12345 10y ago
  Related: if you register for push notifications, Apple/Google have a habit of sending you the same push token as you received on that device previously. It's not guaranteed (and should be insufficient for login), but this does make it possible to track users across app reinstalls.
• a_lifters_life 10y ago
  Its possible they leave a persistent cookie on your device, even after 'deleting the app'