Plus.... you DON'T have to call them. If you have internet service you can go to MYDISH.COM and then bring up the "chat line". Tell the agent you want to change your "service address" but leave "billing address" the same.
Much quicker than calling them and eventually getting an agent from Bangladesh, or some place, and can't speak English without a heavy accent.
And, just to be clear....you will only change to the local "network" channels (CBS, ABC, NBC, etc). Usually those channels below 100. All others (above 100) will stay the same.
Ron