[chipsa]

With electronic billing, you can have a billing address that doesn't actually get a bill sent to it. So if you have something that doesn't require the actual physical address (like a cell phone), you can use that as your utility bill, and no mail actually shows up.

[yencabulator]

That's why cell phones bill aren't accepted as utility bills, for many cases. Electric, water, sewer -- these things have a physical connection, and that's what they want to see.