what is MC7804?

We have a LTE module marked MC7304 on the label.
In windows device manager the name of the device is MC7804.
We don’t get any communication estabished.
In Sierra Skylight it says: no service
I tryed to find out more about an MC7804 device but there are almost no results to find on the internet.

Can somebody help me?

This seems a very rare mishap . Please check the driver installation once, there is no module named MC7804 by Sierra Wireless.
Please contact your distributor/ Sierra Support to help you out regarding this problem.

Thanks & Regards,