Yes you need a sim card and its only programed for the vodafone system it seems.Needs 2-3 bars to send reliably but captures all pics to the sd card anyway. Depending on the way you set it up ie number of pics per burst etc it only send one per group so you don't chew up your sim credit. You can get an external Ariel and solar power packs but a good set of aas should last for months.
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