What to do before selling phone on ebay?

[cbutters]

Hi,
I have a Touch Diamond coming, and I want to sell my Mogul (Titan) on ebay to recover some of the cost... My question is... what do I need to do to sell my old mogul on ebay? Obviously I will want to delete my information and contacts off of it... but do I need to clean out my phone's information that ties it to my sprint account? I see on ebay a lot of people talk about CLEAN ESNs What do I need to do to protect myself and provide the greatest value to potential buyers?

-Thanks