Samsung 32 gb class 10 original sd card. Over 3 months of use with not a single problem. Sandisk is pretty bad, I had problems even with the pendrives. Get a Sony or a Samsung. You better spend the money on a expensive one, you will see that you actually "save" money instead lose money (looks like you know what I mean
). Also, class 3-4 is pretty slow for HD recording and taking photos on burst.
BTW, do you know the cards have warranty right (they say lifetime warranty, but I don't trust them
) ? Also, the S3 have warranty too
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Previous phone: Samsung Galaxy S3 Quad-Core Exynos
Actual phone (probably for my next 2-3 years): Samsung Galaxy S4 GT-I9505 32GB black mist unlocked. The S4 with Exynos Octa is the fail of the year (for me) !