Samsung Galaxy S4 Camera can't save pictures to SD card, remove microSD card write-protection, other memory issues
Galaxy S4 - Insert a microSD Card or Remove it (SGH-I337M) | Samsung Canada
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Samsung Galaxy S4 mini (I257) - Available memory - AT&T
Amazon.com: Professional Ultra SanDisk 64GB MicroSDXC Card for Samsung Galaxy S4 Active Smartphone is custom formatted for high speed, lossless recording! Includes Standard SD Adapter. (UHS-1 Class 10 Certified 30MB/sec) : Electronics