Question about java 5.0 & j2me & wireless toolkit

Hi,
I maybe have a dumb question, but to me it's not totally clear. I am currently developing an application (for J2ME and J2SE) which uses RSA encryption. So I found out that before Java 5.0 RSA encryption wasn't supported, but starting from Java 5.0 it is. So my question now is. If I use the RSA encryption from Java 5.0, can I still use it in my cell phone? And which Java version runs in my cell phone?
It not clear to me, but maybe someone will be so nice to respond...
Can my/any cellphone run Java 5.0 code? So what if I use the mentioned RSA-cipher... or generics...enumerations... On what does it depend whether I can use it for my cell phone or not?
Does it just depend on the compiler? the JVM on my phone? or even the wireless toolkit?
Thank you very much in advance.
Sincerely.

bump...
anyone?

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