Sold my Wifi/3G (64GB) w/ Apple Case. I only got $500 which bums the heck out of me. I know I could have held out for more but a bird in the hand.... When the buyer found out I had a unlimited data plan he offered me another $100 for the SIM card. My intention was to cancel the unlimited plan due to lack of use and just buy a WIFI model. My question is I thought the SIMS were transferable between the same owner if they upgraded or changed to another IPAD not from one customer to another. Doesn't the reselling of the Sim seem kind of sketchy to say the least. I declined the offer and canceled the plan and tossed the SIM. Did I just throw away $100 or did I do the right thing? I would think AT&T would cancel the unlimited plan associated with my account if the account user name (me) changed along with billing info to the new user (not me)? Ethically I could have sold the SIM but he may have been reverted back to the traditional capped plan due to the AT&T rules of use. Thoughts?