Htc One M8 Cases: http://goo.gl/TZqTS4
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If you need to insert the micro sd card and sim card on your htc one m8 it is not too difficult. On the top right of the htc one m8 is the sd card and it is pretty easy to pop out. On the left side is where the sim card installation is. You will need a pin to pop these two inserts out, but usually your htc one m8 will come with one in the box.