Mocha Telnet/SSH2 for iPhone/iPod/iPad
Mocha Telnet with SSH2 support provides access to a Linux/UNIX Telnet Server. Using your iPhone, iPod or iPad , you can connect to a Telnet server and run applications in a VT220 Terminal window. Exactly as you would, if you were sitting at your system console, just on a smaller screen.
Lite or paid version
The lite version (from v 3.4) has a 5 minutes session limitation.