The Jimm project has just released version 0.2.1 of it's Jimm midlet. Please read the README and CHANGES files included in the archives.
Get it from: http://jimm.sourceforge.net/
Changes:
This is a bugfix release, fixing problems with the ICQ login procedure. Furthermore, there are some other minor optimizations included in this release.
About Jimm:
Jimm is an ICQ clone for mobile devices, such as mobile phones. It is written in Java 2 Micro Edition (CLDC/MIDP 1.0.3). It is not affiliated with ICQ, Inc.