I don't think all the "freebies" are worth getting excited about. Unless you plan on paying to keep the FREE 50gb of Dropbox after the 1 year you'll have to find some place else to store the items you have there. The same goes for Hulu+, Sirius and Cisco. I would have been happier with more Google Play credit.
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After you register with the samsung apps, it should automatically register your device with Samsung. They will then send you an email with the link in it and one confirming that you have registered your device. Mine worked, but I do not think all the "freebies" are really worth it.
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