Yes it is the first time that I'm trying to connect via SIM / Mobile Modem in order to have internet to a place that there is no wired installation.
I activated WAN to connect to internet. I have made FW update from server to RUTX_R_00.07.03
I have then installed Modem Updater from (Services -> Package manager -> Packages ->)
Modem Updater - 0a29ac8c
There was no new Modem Firmware update
The System Status for modem is
I have then tested sim card from another Provider (WIND GR), with Manual APN (gint.b-online.gr)
It seems that is working now...!
Now tested previous sim card from Vodafone GR, but i discovered that the given APN was wrong..!
Not internet.vodafone.gr / BUT Vodafone APN = internet
That was the case...!