To remove the battery from the casing, grab the front panel and back panel with opposite hands (as shown). The back panel is the same as the battery.
With your index finger, push in the button on the bottom of the battery to release it.
Pull the battery away from the phone.
After removing the battery, the SIM card is accessible. Locate the SIM card casing at the bottom right of the back of the front panel casing.
To remove the SIM card, using your index finger, carefully lift up and rotate the plastic casing.
Then, the SIM card easily slides out of the casing.