I use Cox cable for my home phone service and just have the basic line without any long distance plan, but I use my cell phone most of the time.
One service that I use that makes it easier to use multiple different phones is
Grand Central from Google. It's free and it let's you have complete control of all incoming calls to one centralized phone number. One great feature is that it blocks unsolicited sales calls. You could set it up to forward to your Skype number. It also takes voice mail and forwards it to your email.