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Attention: Check the compatibility list before installing! Currently DataTrackr only works with carriers in Germany.E-Plus:• 1&1, if you can see your used data volume on www.datatrackr.de/1und1-telefonica• Alditalk, if you can see your used data volume on www.datatrackr.de/alditalkAll other Carriers, which operate in the E-Plus or Telefonica network aren't compatible with DataTrackr.O2:• Is supported, if you can see your used data volume on www.datatrackr.de/o2All other Carriers, which operate in the O2 or Telefonica network aren't compatible with DataTrackr.Telekom:• Telekom• Congstar• other carriers, which can fetch the used datavolume on pass.telekom.de.Vodafone:• Vodafone, if you can see your used datavolumen on www.datatrackr.de/vodafone or with the official My Vodafone app• Vodafone CallYa, if the official Vodafone CallYa app works for you• 1&1, if you can see your used datavolumen on www.datatrackr.de/1und1• mobilcom-debitel, if you can see your used datavolumen on www.datatrackr.de/mobilcomdebitelDataTrackr is an app that monitors information about your cellular data usage. It queries the data from the provider and presents them in the app and in a minimalistic widget. You can also schedule push notifications which are triggered if you used a specific amount of data.