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Siemens C65, CX70, and similar models are interesting as nostalgic Java phones, but setup can be harder than on Nokia. First make sure the exact phone can install Java applications and that you have a way to transfer jimm.jar: cable, Bluetooth, IrDA, or memory card if the model supports it. Install Jimm and check that the app starts without a memory error. In the client settings, set server icq.jimm.fun, port 5190, and a regular TCP connection. Enter the UIN and password from the new account. Most Siemens problems are not caused by Jimm itself but by the internet profile: wrong APN, WAP instead of internet, Java network access blocked, or unstable GPRS. If the client shows a connection error, try a different access profile and check whether the phone can open regular web pages. For CX70 and C65, it is useful to look up GPRS setup instructions for your exact firmware and carrier because the menu names can differ.
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.