OK, a (MOH) modem on hold will (sometimes) work if you have call waiting.
If I may, rather than paying $10+ for dialup, if possible pay an extra $6 and get DSL (Yahoo I think still offers a $16 or 17 package) and it will make a world of difference plus you can still use you phone anytime. If you go this route with DSL, they will send you a modem and all the connections (filters, USB and Network cable).
One more thing, once installed, AOL is hard to remove. It installs into everything.