Seeing no signs that the slowing economy is crimping consumer spending, Verizon (VZ) and Cablevision (CVC) as it pushes its Web video and TV strategy. On the flip side, as the cable companies have started selling phone services, telcos like AT&T (T) and Verizon have seen the decline in landline phone subscribers accelerate. In the first quarter, Verizon’s total phone line count dropped 8.2% from the prior year, a slight increase over the 8.1% pace for 2007. And residential lines fell by an eye-popping 10.9% from the same quarter a year ago.

Raising prices in the face of a economic slowdown is a bold move that borrows from the cable industry’s long-held strategy of continual rate hikes. Two things work in Verizon’s favor here, says one analyst: Phone and TV subscribers aren’t known to be the most vigilant consumers. They may not even notice they’re paying more.

Verizon’s about to find out.