IIRC you can use cell tower loc only when using background location & geo-fe... | Hacker News

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nc on Jan 20, 2011 | parent | context | favorite | on: Show HN: New Punchd website (like foursquare for t...

IIRC you can use cell tower loc only when using background location & geo-fences on the iPhone for local notifications.

Maybe notify a user only for 'popular' punch'd locations?

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