Skype coming to iPhone, BlackBerry: Does it need 3G support?

Skype is officially coming to the iPhone and BlackBerry, but is being limited to WiFi for now. Simply put, don't expect Skype working over a 3G network anytime soon. 

Various reports have Skype unveiling its service for the iPhone on Tuesday and BlackBerry in May. Skype will also work with the latest iPod touch. 

But Skype had to compromise to get its software on mobile devices. Wireless carriers have viewed mobile Skype as a threat so for now it is being limited to WiFi. Apple limits voice applications in its App Store so they only work over WiFi. Skype has already been announced on Windows Mobile, Google's Android and Nokia phones.

Inside Skype for iPhone--photos

Carriers will still get the data plan revenue from Skype, but it's unclear how limiting the WiFi only mandate will be. For starters, I won't be trying Skype mobile out at all on my BlackBerry since Verizon Wireless generally doesn't do the WiFi support thing. 

However, the iPod touch has become more interesting. Will limiting mobile Skype just to WiFi really accomplish anything?