On you Samsung Galaxy A3 smartphone, your SIM card and microSD card are both on the side of the phone where the power button is. They will be located closer towards the middle (microSD) and bottom of the phone (SIM).
you will need to use the pin hole tool or you can use a small paperclip or a pin to pop out the tray that holds them.
see the tutorial (silent) video for a visual how to explanation:
How to put sim card and memory card on Samsung Galaxy A3 A300F
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