Using Java is it possible to upgrade LG U900 version to accomodated some common applications like whatsup? Can its RAM be upgraded? Thanks guys

RAM is hardware. no, you can't update hardware using code.

This is not Android/iOS/Windows phone with regular operating system update. You should check LG site for updates, but there is no guaranty it will lead to Java update since device is using Java Microedition which is sort of dead since 2008/2009

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