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J2ME

The stuff is more likely to be about J2ME.
J2ME empowers you develop very cool features for your mobile.
All you need is a java enabled mobile.
Well, we can discuss all the J2ME related problems here.

Those who have heard of it first time or want to start working on it..
Here's the hint for them :
Go for Hello World example in j2me. So, here's an example for it:
http://www.roseindia.net/j2me/hello-world.shtml

I would refer the books who really want to go for some of the cool reading stuff:
1) Beginning J2ME novice to professional, Apress
2) The Complete Reference, James Keogh
Though, I am not an expert in it but still we can put up our knowledge and experience to make " a mobile, a world in itself".. :D

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