Quote Originally Posted by CoffeeCup View Post
Actually I have a skype application installed on my phone, so once I found a place with free wi-fi access I can make a call to Russia without problems. Or as another option I can make skype calls via 3G network if I get an Internet access plan for a local cellular network.
T-Mobile will let you do that... Unlocked iPhone SIM Card Plans | Bring Your Own Phone | T-Mobile

Quote Originally Posted by CoffeeCup View Post
Did you mean that there are places in US where there is no cellular network signal but there is wi-fi? I have never met such type of coverage in Russia, we have almost total coverage by cellular networks while we have wi-fi points mostly in cafes, shopping centers, airports and other places like that but not an area fully covered with wi-fi.
Yes, there are lots of "dead-zones" here. As an example: When we had Sprint, we had no service in our house. We switched to T-Mobile and oddly enough, there is no coverage at the University of Maryland. When we had Verizon, we had coverage, pretty much everywhere, but they are too expensive. They are also the only company that has service on the Metro underground. All the other carriers, you loose your coverage in the tunnels. Each carrier has dead-zones. That is why here we have the saying, "can you hear me now?"