Zte T809 User Manual page 7

Installing the SIM Card, microSD Card*,
and Battery
Switch off your phone before installing or replacing the battery, SIM
card or microSD card* (optional accessory)
1. Remove the back cover by opening from the thumb catch:
2. Hold the SIM card with the cut corner as shown and slide it
into the card holder. This device uses the standard mini SIM
type, also known as 2FF. Do not insert a micro SIM (3FF)
7