Help preparing a new upgrade for sale please. What to do with SIM???

Hi,

I am on ATT and upgraded from a curve to the Torch. I decided I want to keep my curve and sell the Torch.

The torch came with a SIM, and it seems that when I look on the ATT website, the upgrade contract is not complete until I put the Sim in the phone and activate it.

Should I just put the new sim in my old phone?

I am concerned that if I put it in my new phone, then I will have to erase the OS, personal information, etc - rather than selling a phone that is clean and never activated.

Will the buyer have any problems if they put their sim in a never before activated phone? Is the phone somehow tied to my SIM or my account?

Any input would be appreciated.

They probably have to have a BIS Active SIM Card but you will not have to wipe anything and it should work fine on yours (Curve).