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- G1 Android: ConnectBot (or get from Marketplace). Includes support for SSH keys, which is useful on a mobile platform where you may need to reconnect occasionally.
- Palm/Treo devices: pSSH. SSH2 for Palm OS 5 and up; TuSSH is another alternative if you want SSH1 or Palm OS 4. It does warn that it may not be entirely secure and shouldn't be used for security-critical applications in part because it doesn't use device-specific random number generation. It's got a neat on-screen keyboard, and it can support SSH key auth.
- Blackberry: MidpSSH. There's a useful documentation blog. This should also work on other Java-compliant devices. It supports a predictive text option, which may be useful if you have a device that doesn't have a full keyboard. It supports public key auth, however, there is no facility for a passphrase for the key. It also has macro support to make typing long/common strings easier.
- Symbian devices: The well-known free SSH client PuTTY is available for Symbian. It supports public key authentication but only for keys created using PuTTYGen in Windows. The download comes with excellent documentation, which is also available online.
Note: I've personally tested ConnectBot and pSSH and can confirm they do the job well; sadly, I don't own a Blackberry or Symbian device to test those myself!
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