Am building apps to run on
1: Java phones
2: Android
3; Symbian
4: BB
5: IOS

How do i protect each app 100% uniquely from reverse engineering of the source code.

Don't make the software. You can try, but it'll just make the reverse-engineering process more difficult, not impossible.

There is nothing you can do about it. You are at the mercy of the developer kit you are using.
Questions like this arise when you think your app is the "all in all". Most times its not.

Afterall, even the iphones (owned by Apple) are jail broken everyday how much less your app.

BOTTOM LINE
Make your app, distribute or sell it and move on. Why would anyone want to reverse engineer your app?
Unless is some kind of online payment or bank related app. Even at that, it will be easier to hack your servers than look at your app codes.

codeaddict: Don't make the software. You can try, but it'll just make the reverse-engineering process more difficult, not impossible.

Funny, but this looks like a newbie programmer for you. When you think that you have done a world-class application, the next thing is you start thinking all these kinda thoughts.

*dhtml:

Funny, but this looks like a newbie programmer for you. When you think that you have done a world-class application, the next thing is you start thinking all these kinda thoughts.

Abi