Just as a point of information, by the way: when you have
multiple companies offering DSL to you they are doing it
one of three ways:

1. They're your local carrier; it'll come from the local CO (central
   office)
2. They're another carrier who lease (as is their right) rack space
   and backbone connectivity from your local carrier in a CO (may
   may not be your nearest) to put in their own DSL switching unit
   (DSLAM)
3. They're a carrier that sub-contracts with (1) or (2) and either
   just re-brands the service or in some cases bridges with (1) or (2)
   to get you to their network