Do not attempt to insert the SIM card while the device is powered on. Doing so may harm the SIM card and/or the device.
Be extremely careful when removing the battery cover from the device.
Ensure the device is powered off.
Press and hold the Power button (located on the right edge of the device, below the volume button).
Drag the window to the bottom of the display to power off the device. Once the 'goodbye' message appears, allow up to 15 seconds for the device to completely power off.
With the device facing away, gently pull and remove the battery cover (prying with finger at the upper-right corner of the device). Please use extra care when removing the battery cover so as not to damage the cover.
Use a fingernail to lift the battery out of the compartment.
With the gold contacts facing down, align the card (notch first) then slide the SIM card in until it locks into place.
Re-insert the battery and carefully replace the battery cover. Align, starting at the bottom, then gently press to snap the cover into place.