Hi was wondering if a person had a upgrade on another line could they preorder the iPhone 4 but when it comes in put it on another line? For example my wife has an upgrade that she doesn't really care to use. I got the 3gs last year and not able to get an upgrade till 3/2011. Could I just preorder it using her info so her line would get charged the upgrade? When the new phone comes in would I be able to put my number on it and not hers?