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You can change your email in your profile — open the profile, find the “Change email” section, enter the new address, and click the button. No email confirmation is required: the new email is applied immediately. The only restriction is that the email must be unique, meaning it cannot already be used by another account. The email is needed for signing in to the dashboard and for password recovery, so it is important to provide a current address you have access to. The ICQ account (UIN) itself does not change when you change your email — friends still find you by UIN or nickname.
You need a client, a new UIN, and correct server settings. Use QIP 2005 on Windows, macOS, and Linux, the Jimm JAR on a feature phone, Jimm from Google Play on Android, or, with nothing to install, the web client, the browser extension, or the Telegram Mini App.
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.
