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1. tiga benua login slot For the method of installing the SIM card in the double card slot on the front and back, both SIM1/SIM2 need the chip to face up 2 Parallel dual SIM card slots installation : the SIM 1/SIM 2 chip is facing down 3 Parallel dual SIM card slot + TF expansion card slot installation：SIM 1/SIM 2 chip facing down, memory card chip facing down