If you looking for a SSH Client for your Nokia phone or other phones, MidpSSH is an SSH and Telnet client for MIDP 1.0 / 2.0 (J2ME) devices such as Java(tm)-capable cellphones and other mobile devices.
Download and install MidpSSH by browsing to the URL below on your device.
Select the latest stable version, unless you want to try the latest development version.
Having a Nokia 6300 the Full Build MIDP 2.0 should be downloaded and installed. Else look in the list of supported devices and find the version that fits your phone or device.
For documentation look in the MidpSSH Wiki.