I work for a cell phone company, so here’s the answers:
1.) If a cell phone’s reported as stolen, we enter that into the system, unless the original owner calls in to state that they’ve recovered their phone, any time anyone tries to use the phone, they’re automatically routed to our call center. Unless they can prove they’re the legal owner, we won’t activate it for them.
2.) The codes necessary to program a phone are proprietary to each service provider, so you can’t take a Verizon phone and have Cingular activate it for you. (Verizon’s phones won’t work on Cingular’s network because of incompatible technologies, but even if they were compatible, you still wouldn’t be able to activate a Verizon phone with Cingular service.)
3.) By law, all cell phones have to be able to dial 911 even if the phone has been stolen, had its account cancelled or written off.
4.) In most cases US cell phones cannot be used overseas as the technology is totally incompatible. (Most European cellular networks are GSM based and few US networks are. China and Japan both have some networks that use the same technology as the US, but in all likelihood the phone won’t work there simply because its not registered as a “native” phone and you’d have to enter in your credit card number before making a phone call.)
5.) Cloners don’t need the actual cell phone to clone your phone, usually. Depending upon the type of cell phone you have, it may be “impossible” (i.e. no one’s done it yet) for them to clone your phone. Verizon’s technology is supposedly impossible to clone. (The digital side of it, at least, in analog mode its possible.)
6.) People steal cell phones for three reasons: A.) They can sell use on them for people to make long distance phone calls, even international calls, if that feature has been enabled on the particular cell phone. B.) They can sell the phone to some poor unsuspecting schmuck on a street corner or to a pawn shop fairly easily. I’ve had several people call up and try to activate stolen phones that they bought from a total stranger for almost nothing. C.) If they can reach an idiot at customer service before the owner of the phone does, they can con the CSR into making changes to the account that enable the thief to use the phone for an extended period of time. (Rare, but it does happen.)