I want to buy a device that will block particular phone numbers from coming into my home phone.?

White, Have you looked into Call Screen from the phone company? I kept getting annoying calls from Trimark Funding, after I told them over and over that I was not interested in their mortgages. I called MCI and signed up for Call Screen. The calls have been blocked ever since.

This is because in the US, the phone companies do this for you (of course, at an extra charge). You might be able to find the instructions on how to block individual numbers in your provider's phone book (ie-Qwest has a specific section on the services you can activate from you phone). If it isn't listed in your phone book, call your phone company to ask them for specific instructions and costs.