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The best phone for Jimm is not always the rarest one. A comfortable keypad, stable Java, readable screen, and healthy battery matter more. Many Nokia Series 40 models work well because they have clear menus and simple file management. Nokia Symbian / Series 60 devices are interesting because they offer more settings and often handle files better. Sony Ericsson K and W series phones are pleasant for Jimm because of good navigation and solid Java support. Siemens C65, CX70, and similar models have a strong nostalgia factor, but they may require more work with GPRS and file transfer. When buying an old phone, check more than appearance: does it power on, does the battery hold charge, does charging work, can you send a JAR file, does it support the needed network bands, and is there an internet profile. For “ICQ on a feature phone”, choose a device that is actually comfortable to type on. If you only need a quick test, Android plus J2ME Loader is more practical.
You need a client, a new UIN, and correct server settings. Use QIP 2005 for Windows, Jimm JAR for a feature phone, or J2ME Loader on Android with the same JAR file.
Jimm is for real Java phones and mobile ICQ nostalgia. QIP is useful for first testing because desktop errors are easier to see and settings are faster to change.