The following is taken from the Quick Start Guide, which can be downloaded here. The Quick Start Guide can also be found in the product box your device came in.
The slot for the Nano SIM card is located in the battery compartment.
- Slide metal lid from “LOCK” position to “OPEN” position
- Open metal lid to allow Nano SIM card to be inserted
- Place Nano SIM card against contacts, chip face down
- Close metal lid
- Slide the metal lid of the Nano SIM card holder back into the “LOCK” position