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In Jimm, open account settings or network settings and replace the default server with icq.jimm.fun. Set port 5190 and choose TCP or a regular OSCAR connection. Use the UIN created during registration as the login, not the email address and not the nickname. The password is the one used when creating the account. If your Jimm build includes proxy settings, keep a direct connection or disable proxy. On old phones, also check the internet profile: carrier access point, permission for Java apps to use the network, and no restriction on socket connections. Some phones ask for network permission every time the app starts; that is normal. If Jimm hangs while connecting, test the same account in QIP on a computer first. That makes it easier to tell whether the issue is the phone or the login data. On Android with J2ME Loader, the settings are the same: server icq.jimm.fun, port 5190, UIN, and password.
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.