We have created these steps (+video) to guide those who may need to change their WiFi dongle's sim card from Optus to Telstra.
To insert the micro-SIM:
Remove the back cover using the thumb catch on the corner of the hotspot.
Remove the battery.
Slide the micro-SIM into the slot, with the gold-coloured contacts facing down.
Make sure the micro-SIM is secure.
Reinsert the battery.
To turn on your hotspot:
Press and hold the Power button until the LCD screen lights up.
Now, you need to change the APN in the settings.
Tap on Settings
Tap on Network
Tap on APN
Tap on +Add
Tap on Name
Type in Telstra
Press OK
Tap on APN
Type in telstra.m2m
Tap on OK
Scroll down
Tap on Save
Scroll down and choose Telstra
You can also watch the videos below:
Video of Part 1: https://youtu.be/efPvDhkvdr8
Video of Part 2: https://youtu.be/6je5Vjpz9tU