Connect to Wi-Fi in Europe /South America / Australia with iPhone 4S?

I have a Virgin Mobile iPhone 4S
I have plans to Go to Italy and London in January, Rio de Janeiro in February and Sydney in March
3 Months of Straight Travel However,
I understand I will NOT Be able to access my phone minutes or anything overseas; But,
While in these countries, Will I be able to access the Wi-Fi signals at restaurants and places including my hotels and download a Wi-Fi phone app that will enable me to make calls and use data on Wi-Fi

Added (1). I'm from the United States

YOU can still still use Wi-Fi weather you have access to your phones minutes or not.
A perfect APP would be http://viber.com/. Just make sure the people your are calling have this app on their phones too. Or you can pay a little extra using skype to make phone calls.see, The possibilities are endless as long as you are connect to Wi-Fi.

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