I am thinking of buying the Simple Choice Plan which states "Wi-Fi" voice calling to USA from Europe is free. I have the iPhone 4. Please indicate the EXACT process for calling USA landline numbers from Greece to USA using the Wi-Fi process, i.e
A. do you have to use some app or simply dial using 01-xxx-xxx-xxxx ?
B.Make sure that the data feature is turned off on the phone and WIFI is selected on the phone ?
C. is there an indication on the phone for signal strength of the WiFi ( i have read it has to show 2 bars or more)
D. I have read some place that you have to be within 15 ft of router this makes this feature absolutely useless in hotels with WIFI.
E. How do I know I have not been charged for international roaming until I get back ?
Thank you