How to manipulate and use cell phone operating systems

I have recently been messinga round with Netbeans 5.0 beta 2 with the MIDP pack. I am really enjoying it, but I am confused on something.
I have an idea for a program that I want to create, but I want to be able to use it in an actual operating system. For instance, cingular, verizon, etc. all have phones that have operating systems on them. I don't know if they are operating systems as much as user interfaces. I want to know how I would be able to program an application for these systems specifically. Is there a way that you can access the code for these or anything like that? I really don't know how to ask this because I do not know much about the cell phone systems. Could somebody please inform me. Thank you.

I hate that word only.
There is no "ONLY" in the world of software. :P, well, I don't like the word "manipulate" either, so any disencourigement would be on it's place ;)
There are ways to get to the lower level stuff but I
believe that most Java developers would discourage
it. The problem with it is that writing for that
level means that the os is stable. Which is not the
case. What would that have to do with anything? Palm OS, Symbian, an windows mobile (and even linux), are all stable. The other devices, simply don't have an OS, or at least, don't have an open OS where you can do stuff with. That's the real problem.
Sure the os that the system uses may be
excellent. But the next version of the hardware
might not have the same underlying os. Try writing a
program for a palm pro and running it on a new palm.
Backwards compatible is not always there. Since the
e rate of output from hardware developers is not
slowing I'd avoid this. That's why you sould keep to api's. They ensure compatibility. Sure it might low stuff down sometimes, but who cares?
Having said that. There is nothing like writing some
low level code that pushes the edges of the hardware
in directions even the os builders didn't think to
go. Mind you java might not be the tool to do that.Very true, but this is out side of the scope of this forum, and therefor irrelevant.
If you really want to do low level code, buy a nice cpu, make your own PCB and start programming without any api's, or even do it in assembler!

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How to manipulate and use cell phone operating systems

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