here some Steps
Understand regular Java game-making. Try to create a desktop version of your game first.
Know the limits of J2ME. J2ME is the JRE loaded on Java-supported phones. It's limited in some ways.
Know the limits of the phones you're targeting. For example, some phones have J2ME 1.5.
Test it. There's more limits in J2ME, and possibly your target phones.
Sign the JARs. VeriSign and StartCom (just to name a few) offer code-signing certificates.
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