Castles Technology Co., Ltd. All Right Reserved. Pg. 12
2.4. Insert GSM Micro SIM Card
Step 1: Remove battery cover / back cover
Step 2: Insert GSM Micro SIM card into desire slot.
SIM 1:
Cut corner is on the upper left side of card and facing down.
SIM 2:
Cut corner is on the lower right side of card and facing down.
Step 3: Reverse the operation of step 1 to install the battery cover.