Best Phone and Voice Services
A few notes on phone & voice services:
To obtain an inexpensive toll-free number for your organization or business, try Grasshopper or RingCentral.
For an Internet phone service that lets people use a regular telephone number to contact you, register an "online number" at Skype.
Twilio has a very powerful phone API, but can also enable easy call tracking and number routing for those with a non-technical background