I don't have a way to test if the case blocks EMI, but based on feedback from users who have actually tested it, it probably works fine. What I like about it is that it's just a very good case! The fabric is softer and more flexible than I thought it would be, but it still offers ample cushioning, especially when combined with the tough, shockproof case that's attached to my phone. There is also enough space in the case for a pop socket and headphones. At first I found the price a bit high but now I find the price matches the quality.
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