What are some alternatives?
When comparing Google Voice and Grasshopper, you can also consider the following products
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Viber - Free and secure calls and messages to anyone, anywhere. Keep your conversations going no matter where you are.
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.
UberConference - UberConference provides a rich visual interface for conference calls. Simple, visual, and free to use, it's audio conferencing done right.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
8x8 - 8x8's VoIP business phone systems deliver affordable, cloud-based voice, video, messaging, and call center solutions, helping you serve customers anytime, anywhere.