About DSL and phones... the data for voice and DSL are on entirely different frequency ranges, but the DSL range does add annoyances on the voice level. The preferred (for me at least!) method of dealing with this is to simply have a POTS (plain old telephone service) splitter installed where the phone line enters the house, sending a data cable to the DSL device and all remaining phone lines function normally. Alternatively, the DSL line filters can be installed for each phone to remove the higher frequency DSL data. When I signed up for PacBell DSL service, a POTS splitter was provided and installed, but I am told that many services (including PacBell now) often simply provide a single line filter instead.