Zte V790 User Manual page 15

2. Hold the SIM card with the cut corner oriented as shown and
slip it into the card holder.
Caution: Install your UMTS or GSM SIM card into SIM slot 1.
Install your 2G SIM card into SIM slot 2. SIM slot 1 is the main slot,
SIM slot 2 is the auxiliary slot. Viettel SIM card should be installed
in SIM 1 slot.
3. Hold your microSD card with the metal contacts facing down
and slide it in.
SIM slot 1（SIM1）
SIM slot 2（SIM2）
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