I use OOMA, and recommend it over the landline we used to have. There are other lower net cost options out there, too. IP Daley has some recommendations, but after the poor quality we had with Magic Jack (in 2009), I wanted something with consistently good reviews.
The OOMA has voice mail that can be emailed to you, and an ap to notify you of calls, call forwarding, even a mobile ap with your home landline number, to take calls when you are out of the home. Mobile ap is not as clear as the home phone.
OOMA was $100 or so for the hardware, plus $5 per month for basic service for local taxes / fees.