Looks like you got an answer. However, carriers do share the ESN and IMEI numbers for devices and check for blacklisted devices. Prepaid plans may be a different matter, but I'd be willing to bet that they wouldn't activate it on any contract plans and you'll not get any kind of warranty on the device. So, if you break it, lose it, or brick it, you'll have to pay full price for the device. Probably would have been cheaper to pay your bill...