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If Jimm does not connect, do not reinstall the client immediately. In most cases the issue is in one of four places: wrong credentials, wrong server, proxy, or the phone internet profile. A connection error often appears when the Java app cannot open a TCP/socket connection: for example, the phone uses a WAP profile instead of a full internet APN, the carrier blocks the connection, or Java network access is denied. Login failed usually means a wrong UIN or password, or an attempt to use credentials from the closed official ICQ network. In QIP, similar symptoms can look like qip cannot connect, icq server unavailable, or server not responding. The fastest diagnostic step is to test the same UIN and password in QIP on a computer. If QIP logs in, the account and server are fine, so debug the phone. If QIP also fails, check UIN, password, port, firewall, VPN, and proxy.
The most common causes are wrong UIN, wrong password, enabled proxy, old official server, blocked port, or a phone WAP profile instead of a full internet APN.
Test the same account in QIP on a computer. If QIP logs in, credentials and server are fine, so debug the phone. If QIP also fails, check UIN, password, and network restrictions.