So, I own a 3GS that I bought on launch day. Of course, being the loyal customer that I am and have been for the last 5 years, I am not eligible for an upgrade on this line until February of 2011. However, there is a different line on the account that involves a 3G iphone and will be eligible for upgrade immediately with their new offer. My question is, am I able to upgrade that line to the new iphone, take it as mine, and give the other line holder my iPhone 3GS? Am I able to do this legitimately in regards to their TOU or anything else?