From Ebay http://reviews.ebay.com/Checking-your-cell-phones-compatability_W0QQugidZ10000000000035131 Basically, they say call your provider and check the number.
You can find the ESN number on a Sidekick LX by removing the battery and reading the label. It is a unique number which identifies the phone on the network.
ESN means Electronic Serial Number. The ESN is an identifier that is inside a cellular phone that does not use a SIM card.
electronic serial number
You cannot (as a consumer). Me working in the telecom business can. The ESN is associated with a number, but has no direct interpretation or formula to derive a number from it.
Yes
serial number mavis beacon
ESN is an acronym that can stand for a number of different things. Some of these include electronic serial number, electronic security number, English speaking nations and engine serial number.
A Clean ESN number means that your phone can be activated by a wireless carrier. A dirty esn means that the phone is linked to an account that has a past due bill or balance or a phone that has been reported lost or stolen. Ask for the ESN# from the seller and call the carrier to see if it is clean before purchase.
It means "Do Not Buy". A bad ESN simply means the phone is locked or for some other reason you CAN NOT get it activated. Ask the seller for the ESN number, call the carrier of the phone and ask them can they run a check on the esn of that phone and they will tell you why the ESN is bad.
http://brewforums.qualcomm.com/archive/index.php/t-11899.html
esn means phone is unlocked
Contact your service provider from a different phone and they will need to get the ESN from the back of the device. There will be a white label inside the phone underneath the battery and the ESN will be there. Once they have the ESN and change it in their billing system they will walk you thru manually programming the new device with your old number