How To Disable OTA/Enable WiFi Only?

How To Disable OTA/Enable WiFi Only?

I've searched and searched and I've come up with nothing, so if this post should be a repeat of some other I apologize now, right off the bat.

That said, I last looked at Opera 5 when it was in the Beta. I was hoping that this problem would have been addressed since the final version has been released. I jumped feet first into Opera 5, upgrading from Opera 4.2 on a Blackberry 8320.

I cannot, for the life of me, find a way to disable OTA transmissions. That is to say, I do not want to use Edge/ATT/3G/WhatHaveyou. I want WiFi. Wi-Fi is free, Wi-Fi is good.

Though I live in worry that due to some fluke or another Mini 5 will up and decide to use the Edge network and get me charged into oblivion.

Now please, if someone could enlighten me as to how to make this happen I would be very grateful. If there should be a trick that applies to the Blackberry software, let me know. If it is a setting I overlooked in Opera Mini 5, I'd love to see it. Any and all fixes and workarounds are profusely appreciated.

At the very least, can anyone assure me that Opera Mini 5 will connect through WiFi if both 3G/Edge and WiFi are turned on?

Thank you in advance