The customer lives in a remote area deep in a valley and cannot afford broadband?

I'm not sure what you mean by "broadband"; I'm assuming you mean wireless.

So: wireless is out, satellite is likely out ("deep in a valley", though if the valley is broad enough or runs in the right direction it could work), DSL is PROBALY out ("remote area" ... DSL only works fairly near the phone company's central office). Cable may be an option if the area is served by cable and the cable provider offers it. If not, you're pretty much stuck with dialup.