said by ViperJohn:Your modems MAC address is tied to you customer account number. Your street address is just where TWC mails your bill to.
There is no need to cancel your account or call customer service. You can change your street address at: »myservices.timewarnercable.com/myservice .
Just login, go to My Account/Profile and edit away.
Your account has 2 street addresses, one for billing, one for the service. Often they're the same, but they are independent entries.
You can't just change service locations by changing the billing address. You have to call customer service to change service addresses. Depending on the situation and the locations involved, one account may need to be closed and a new account setup. The account number ranges are usually assigned to specific service areas. Service areas are delineated by a combination of city/county lines, zip codes, channels maps, and hubs providing service. If any of those change between locations, they're different service areas. Keeping the same account number across different service areas isn't possible, as far as I've experienced in the last 15 years with multiple cable providers.
If the OP takes your advice to just change billing addresses and someone moves in to the OP's old apartment, the OP will be paying for their service, not the service at his new location.