How to install the SIM card in Samsung Z3(SM-Z300H)?
Firstly, remove the back cover and battery and then insert the SIM card with the gold-colored contacts facing downwards. Insert the primary SIM card into SIM card slot 1 ( 1 ) and the secondary SIM card into SIM card slot 2 ( 2 ).
NOTE : Do not insert a memory card into the SIM card slot. If a memory card happens to be lodged in the SIM card slot, take the device to a Samsung Service Center to remove the memory card.
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