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A comment on Ask HN: Idea Sunday. Parent comment

Re:Ask HN: Idea Sunday by jasoncartwright on Sunday April 20, 2014 @12:27PM (#7617355)
Have it work offline to avoid massive roaming charges.
[ Parent | on HN ]
Re:Ask HN: Idea Sunday by stonecrops on Sunday April 20, 2014 @01:58PM (#7617760)
Get close to this with BLE beacons at travel points of entry?
[ Parent | on HN ]