Lilygo T-SIM7080G-S3 not working?

[tuannobick]

Hi guys, I just ordered the above board and tried many times with the examples according to the above link, but none of the examples work.

https://github.com/Xinyuan-LilyGO/LilyGo-T-SIM7080G/blob/master/examples/MinimalModemGPSExample/MinimalModemGPSExample.ino

I am not getting any data from Serial Port. I do not have a camera attached, and am using m2mone sim card - Australia (activated).

I also try to try a simple example with DHT22 sensor but still not getting any data from Serial Port.

Anyone who has used this Lilygo T-SIM7080G board please give me some advice.
Thank you
Tuan