Switch off Switch off the Balance 310X and disconnect it from the power supply.
Removing the cover Remove the SIM card cover on the back of the device.
You do not need any special tools for this as it is easy to remove.
Inserting the SIM card Carefully insert the SIM card into the slot provided (A).
Make sure that the cut-off corner of the SIM card is aligned with the notch in the slot.
Replacing the cover Replace the SIM card cover and press it on lightly until it clicks into place or secure it with a screw.
Switching the device on Reconnect the Balance 310X to the power supply and switch it on.