To install a SIM card into a ZTE phone, locate the SIM card holder inside the phone, insert the SIM card into the SIM card slot, and then restart the phone. This process works for ZTE Zinger, however, the exact process depends on the model of ZTE phone.
To open the back cover of the ZTE Zinger phone, go to the bottom side of the phone towards the mouthpiece, and then look for the empty slot on the left side. Insert your fingernail or a blunt flat object into the empty slot, and lift it up gently.
Locate the small black tab inside the phone, press it gently and insert the SIM card. The metal contact section of the SIM card should face downwards when inserting the SIM card into the SIM card slot. Make sure the SIM card is properly positioned into the slot before installing the battery and closing the back cover.
To confirm whether the SIM card has been installed properly, switch on your phone, and check the network bar. When the SIM card has been installed properly, the name of your network service provider should appear on the screen and the network bar should indicate that there is an active coverage.