windsmith,

There is a company that sells a serial cable for the i730

Serial Data Cable for Samsung SCH-i730 SCH-i-730

However, they report limited stock on their website.

I have occasionally used PocketPutty as a terminal application on my i730

PocketPuTTY Homepage

I don't really know of any solution to hardwire the i730 to Ethernet.

Regards,

Kevin