I mean if I can build all the iPhone apps without interface builder? If yes, where can I find some stuff about this?
I think you can use phoneGap . You build iphone apps using regular html, css + javascript.
You can indeed (see Roman's answer), but the real question is - why.
IB is a very powerful tool, that helps you put together UI's very quickly. The way it works is different than most other GUI developers, in that it's not generating code for you - instead it's like you are assembling live objects and setting properties on them, then freezing them for later. Once you have the "thawed" objects it's easy to do further manipulation.
One good example is UILabel - in code you are going to be setting several properties, never mind the frame to make use of a label - whereas in IB you can have multiple labels on a page in seconds with custom font and appearance settings.
So what are you hoping to gain from not using IB? Just be sure you are making that choice for the right reasons.