Just a thought. Now that the new Nexus 7 has LTE support for Verizon and AT&T, how can a carrier blacklist it because of lack of payment? For example you have put a Nexus 7 on a Verizon contract and defaulted on the account, can they prevent the use of the tablet on AT&T? Could relieve, and increase it's resale value, don't you think? I got stung by buying a clean ESN phone from ebay, only to get it shut off after a month or so.