Except WiFi probably won't work without a plan, so there's really no point.
WHy wouldn't WIFI work without a plan?
I have WIFI on my phone and can use it anywhere there is a open access point. How I use my WiFi functionality is none of FIDO's business, and neither can they do anything about it, even if they wanted to ( apart from cancelling my monthly contract ).
No cell phone provider should imped the WiFi functionality of the phone ( aside from disabling it ).
For those hoping for VOIP, Apple may choose not to expose the API in the SDKs....
Finally, if you think 3rd party software will make your iPhone unstable, dont install any
But don't restrict 3rd party software.