Many of our clients who order Sierra Wireless AirLink GX400 or GX440 cellular gateways with WiFi (like these models 1101531, 1101691 ) find out the hard way that the SIM is very difficult to install. The SIM does not come pre-installed, and the process is not quick to perform. Do it incorrectly or incompetently and risk doing damage to the device itself. I highly recommend opting to have the SIM installed at the time of sale. Companies like USAT Corp. do that service for a very nominal fee and it comes as a standard part of the device provisioning (DevProv+) professional services. However, if you find yourself in the situation of having to install the SIM yourself, know this key information:
The SIM slot is located on the front left (as you are looking at the side with the lights and the reset button) behind the plastic cover. To access the SIM slot on the device you must remove the plastic cover with a 2mm or 5/64” hexagon Allen wrench.
Step 1: Unplug your GX400/440 from power source.
Step 2: Remove the four hex screws on top of the unit (used to secure the black cover) using a 2mm or 5/64” size Allen (hex) wrench. Place screws in a safe spot, these screws will be used again.
Step 3: Remove the nut and washer from the front facing SMA connector using a 5/16 or 8mm socket torque wrench to a torque spec of 8in-lbs. Place nut and washer in a safe spot, these will be used again.
Step 4: Slide the top black cover off of the device.
Step 5: Install the SIM card with the gold contacts facing down and the cut-out facing to the right.
Re-Installing The Cover Plate
The cover has a tab to mechanically secure the SIM in place during extreme vibration. When replacing the cover:
Step 1: Install the black cover by lining up the SMA antenna connector with the hole in the cover, tilt the rear of the cover slightly to make sure the front bottom of the cover seats in the front ridge, and then push the top of the cover down.
Step 2: Re-install the 4 hex screws on top of the unit.
Step 3: Place the lock washer onto the SMA antenna connector and push to the face of the cover.
Step 4: Install then tighten nut with a 5/16 or 8mm socket torque wrench to a torque spec of 8in-lbs.