Asus Transformer Pad TF300TG - Manual

ASUS Transformer Pad 
ASUS Transformer Pad QSG
TF300TG 3G Connection Manager
E7210
Installing SIM card
1. Use a straightened paper clip to press the SIM card tray eject button.
2. Remove the tray from the slot. Orient and place the SIM card on the tray.
15060-05W00100
3. Firmly push the SIM card tray back to the slot.