Will Not Work In Low Battery \ Power Saving \ Stamina Modes! As some others have pointed out  if you use the power saving mode in your phone  Orbot won't be allowed to transfer data in the background  thus preventing apps like the Orfox browser from working. Either turn off power saving  or change its settings to allow background data. This should be highlighted in the app's description  since it's not very apparent to many users  and they might give Orbot a bad rating for something that isn't its fault. Thanks to the Guardian Project for this awesome app!
October 31 2016