New Spark Modem has open unsecured open connection

Hi there

I need advice and or help on my new Spark WiFi modem (delivered in the last week) ... we have three connections available .. the two standard secure connections on 2.4 and 5 GHz bands which I understand.

The WiFi connection from the new modem that I don't understand is an open connection that is unsecured. I have spoken to a few technicians at Spark about this but don't get an answer that makes sense. Has anyone come across this ? What should I do ?

I have connected to the admin page of the modem in the usual way but this open connection cannot be accessed or seen.

When I power the modem off ... I see all connections on my mobile phone and they are marked as 'Not in range' as is usual when you are not near to the WiFi source.

Thanks for any help