: Place the Mini-SIM card into the slot with the gold contact area facing down . Ensure the cut corner of the SIM matches the orientation shown in the slot's diagram.

If the phone displays an "Insert SIM" or "No SIM" error after installation, try these common fixes:

Insert the SIM card and battery - Nokia Asha 311 - helpdoc.net

: Place your fingernail in the notch at the bottom of the phone and lift the cover off. Remove Battery : Lift the battery out of its compartment. Open SIM Holder : Locate the SIM card holder.