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You cannot use the old official ICQ network in 2026 because the original service has been shut down. What you can use is a new retro server that accepts connections from classic clients. For the user, the flow feels close to the old one: there is a UIN, a password, a contact list, statuses, and a client such as Jimm or QIP. The important difference is that the account is created from scratch and the client connects to the project server instead of the old AOL/VK network. This is useful if you want ICQ on a feature phone, Jimm on Nokia or Sony Ericsson, QIP 2005 on Windows, or simply the feeling of early mobile internet. The setup normally needs three things: a client, a new account, and server settings. In the client, use host icq.jimm.fun, port 5190, and a TCP/OSCAR connection. If the client offers proxy settings, keep proxy disabled. This is not a replacement for modern messengers; it is a separate nostalgic messenger for people who miss the old style of chatting.
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.