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yes i see them having the same problem but none of them knows what's going on. i already tried the suggestion as my phone was only factory reset on july 1http://androidforums.com/samsung-ga...537411-email-constantly-downloading-data.html
The above thread discusses the same issue you are having. Maybe try its suggestions first.
i set it to sync every hourIf you have it to sync every 10 mins or so it will eat data up fast