LMS - strange connection across 2 different networks with iPhone & iPeng 8

Hi there

I'm running LMS 774 on a laptop and have two SBTs connected via a dual band home router.
The 2.4 band - which the laptop and SBTs are on - has the SSID 'Telstra1234'.
LMS can see the SBTs without issues (but the connection is not automatic. I have to manually click connect on the SBT each time.)

Anyway, the strange thing is that I have iPeng8 on an iPhone 5 - and this iPhone 5 is NOT on the above network with the SSID Telstra1234.
Instead, the iPhone 5 is on the router's 5ghz network with a different SSID, ie, 'Telstra1234-5G'.

Why am I still able to access LMS on the laptop and control the SBTs through my iPhone across different networks ??

rgds
Shiraz