BB Curve :: Wifi Usage For 8520?

I recently just purchased a blackberry curve 8520 with Fido. My phone is connected to my wifi at home, but I want to make sure that I am strictly using wifi NOT data (because I do not have a data plan). I noticed that in a public wifi network, a red asterisk appears on the WiFi symbol on the top right hand corner of the phone. Like this :( the WiFi symbol is circled to demonstrate what I mean when I say WiFi symbol and the asterisk appeared like so)However on my home network , though it says it is connected, the asterick does not appear. As you can see it says "Fido-peanut butter" ( my router name) meaning yes, I am "connected".... BUT without the red asterisk on the wifi symbol ( with my home WiFi) Does this mean I am not properly connected? I called Fido and the CSR said she thinks it has something to do with login password in the public WiFi, but she is not certain.

The problem seems to be this: When I go to "Mobile Network Options" to turn "data services" OFF( to make sure I am only using wifi and no data), the connection fails and I get this message:When I turn it ON, I am able to connect. For "Connection Preference": what setting should I set it to if I do not want to use any data BUT WIFI? Yes, the obvious answer would be to choose "WI-Fi" only, but this means I will not be able to call/text because my mobile connection will be turned off. So, how can I verify that I am really only using wifi and not data when both the data service is ON and my wifi is "connected"?This is a checklist of what I have done:

1) HOTSPOT USER - check.

2) insterted pin provided by the phone into my dlink router (via online)

3)tried the push button setup

4)rebooted my router/modem

5)there is a checkmark beside WiFi connection:

It would seem like I am connected to Wifi, but again, to reiterate I would like to ask if WiFi is the ONLY thing I am using and not Data.