[Geekcop]

This may seem kind of obvious, but wait until your Diamond arrives before putting your Mogul up on eBay. That way, your Mogul will be taken off your account and your # switched to the Diamond. You'll want to back up all your PIM data (contacts, calendar entries, notes, etc) and any documents. Do this via a backup program (SPB Backup is a good one) or Dashwire,or both. Your ESN (electronic serial number) uniquely identifies your device on a carrier's network. If a phone is reported lost/stolen, the ESN is blacklisted and that phone cannot be activated on a network. Conversely, a clean ESN is one that has not been reported lost/stolen and will allow it's associated phone to be used.