Mitel - Business Communications and Collaboration
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.
XO Hosted PBX - Hosted PBX is a scalable UC solution that uses cloud technology to integrate HD voice & data services, mobility, along with advanced calling
TextMe - TextMe is a free calls and messaging application at both local and international levels.