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.
The Wireless Home Phone T2000 comes with the SIM card installed.
Ensure the device is powered off.
Remove the battery cover.
Disconnect the battery cable then remove the battery.
With the gold contacts facing down, align the card (notch first) then gently push the card in until it clicks into place.
The following image is showing the physical location of the SIM tray and is for informational purpose only.
Connect the battery cable to the socket on the device then insert the battery as shown.