Is it possible to use an iPhone 4 without a data plan and just use wifi when available?

Yes the iPhone does that by itself. As far as why that is not happening in this case I'm not sure. Try restoring it & see if it helps.

Also the iPhone 4 is not a 4G phone. 3G only.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.