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GPS newbie here.

Looking at this product: http://dx.com/p/gps-gsm-gprs-tracker-for-personal-remote-positioning-29284

How does a GPS tracker work without a monthly plan?

Thank You.

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Did the simple lack of information on the website lead you to that conclusion? To me, GSM indicates cellular service is required. I would also check with your state and local laws to determine whether such a device is legal. –  blah238 Nov 18 '12 at 6:30
    
@blah238: Actually I was lead to that conclusion based on a user review (from Brazil) and their comment "Recommend it to all who want to see free of monthly plans." –  Greg McNulty Nov 20 '12 at 3:10
    
From the same comment "And the best fast, just have credit in the chip." That sounds like he was using a prepaid SIM card. –  blah238 Nov 20 '12 at 3:35

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