SimpleTerm 5.1

the author of this app says:

SimpleTerm doesn't perform any terminal emulation, but it does allow you to use AT commands to connect to remote computer systems using a modem or serial cable.

The Pilot can be used a with NullModem adapter, available from USR.

A clipboard feature is included, but the clipboard has a limit of 1,000 characters.

There is also a paste function, which copies the clipboard to the send buffer, but this function is limited to 40 characters.

Connection speeds of 1200, 2400, 4800, 9600 or 19200 are available.