If you don't have an AT&T account you can go through this link: http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=Samsung Captivate (TM) Refurbished&q_sku=sku4960347
and sign up for new account/contract
But if you are an existing customer and want to upgrade, you have to follow
the instructions below:
1. Go to your wireless account and sign in
2. Go to upgrade and select whichever line you want to upgrade
3. Select a phone from the available list ( e.g the new Captivate because
the Captivate refurb is not on the list)
4. After the product page loads in the address bar erase everything AFTER
device=
5. Replace with the following : device=Samsu ng+Captivate +(TM)+Refurb
ished&q_sku= sku4960347
6. Add the phone with the data-plan to your cart and check-out ($0.00)
7. $18 upgrade fee applies to your next bill
8. Wait for your phone to arrive