Don't mean to hijack this thread, but I'm planning on doing something similar during a trip to Italy this spring ('13).

I have a US Verizon iPhone 4S and will get an Italian TIM SIM card (+data) when I get to Italy. I want to be able to forward calls & texts FROM my cell number TO Google Voice, so I can retrieve them using Google Voice on the web or the Google Voice App on my iPhone. (I already have a Google Voice number.) Will this work? Any 'gotchas' I should be aware of?

I tried to use Google Call (Chat) during a trip to Greece a couple years ago, but it didn't work. I'll probably use Skype for calls back to the states (for work, if necessary), but I just want to verify that my plan to get voicemail & texts using Google Voice for the Italy trip will work.