Line2 - Line2 adds a second phone number or complete cloud business phone system to smartphones & computers that's robust yet affordable. Buy online or get a custom quote.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Phone.com - VOIP Business Phone Service + Virtual PBX
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Burner - Disposable phone numbers -- now with MMS photo support