Here's the Verizon page on setup.
http://www.verizonwireless.com/support/call-forwarding-faqs/
Try the "How do I stop..." entry.
This recently started. When my cell phone rings and I do not answer, my home phone starts ringing and the answering machine at home will pick it up. How do I stop this? I did not knowingly change any settings and my cell phone is through Verizon while my home phone is through Time Warner Cable. I do not know how this is possible.

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