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It depends on your smartphone and how much you want to spend. If you use a phone with a decent camera and want to record video in sunlight without exposure issues, an ND4 or ND8 will cover you in most situations - they're cheap and attach with magnetic clips. If you're serious about it and want the best quality, filters like Neewer offer good value for money, though honestly for smartphone video a simple ND filter is more than enough.
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