I need to sell my blackberry, how do i delete the ESN (also known as the MEID).

i think its ##000000 enter from the phone screen. At least thats how i changed my number in my phone.

You can't change the ESN... its the electronic serial number to allow carrier to set the phone on their network.. its like the IMEI (for GSM)

well how do i "clean" the esn than?

why you want to do that

a wipe and a default IT policy if u ever hooked on a BES

you can't play with the ESN...