Originally Posted by 1000rrren
So if i get a curve from ebay and its unlocked...i can put in my sim card and start using the service under my account? Just want to understand the benefits of doing this. Im looking to get a curve off of ebay.
An unlocked phone allows you to use a SIM card from any compatible GSM carrier.
Since the Curve is AT&T branded... it will take AT&T/Cingular SIM cards by default. It wouldn't need to be unlocked in order to use an AT&T or Cingular SIM card in the device.
If your carrier was T-Mobile... or some other GSM carrier... then you'd need the phone unlocked in order to use that T-Mo or other carrier's SIM card in it.
If you buy the Curve off eBay, just make sure you add a BlackBerry Data Plan to your wireless account. The phone will basically be crippled without a BlackBerry Data Plan.
Putting your SIM card into the phone will allow you to use the phone and SMS messaging... but you on't get web browsing*, email, or data features without a BlackBerry Data Plan.
User LunkHead is working on a FAQ for buying BlackBerry devices from eBay. You should look for it and read it before you make your purchase.
EDIT: Found the thread which discusses it: FAQ -- How to buy a BB on eBay