Follow the steps below to insert the SIM card.
First of all, switch off the phone. Second, pull the battery lock on the back of the phone, and hold it in its position. Next, slide the cover, and lift the battery. Then insert the SIM card into its slot, and make sure that golden connectors on the card face into the phone. The beveled corner is on the left. After that, align the golden connectors on the battery with corresponding connectors on the phone, then push the opposite end of the battery until it snaps into place. Now, slide the cover back onto the mobile phone. Finally, switch on your phone and you’ll see the signal of your SIM card on the phone screen.