As a small business you may be able to get away with not having a business phone system for some time. But at some point, it starts hurting your business.
Unlimited outbound calling to land lines and mobile phones in these countries*
Argentina, Australia, Austria, Brazil, Canada, Costa Rica, Croatia, Denmark, France, Germany, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy, Latvia, Lithuania, Luxembourg, Malta, Martinique, Mexico, New Zealand, Norway, Poland, Portugal, Puerto Rico, Romania, South Korea, Spain, Sweden, Switzerland, Taiwan, United Kingdom, United States
*Fair use policy applies