Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
AVOXI - AVOXI to deliver amazing call quality & an exceptional customer service experience.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Sonetel - Sonetel is a communication app that lets you make an international business call at the cost of local calls.
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.
Global Call Forwarding - Global Call Forwarding offers local and international toll free numbers which can be forwarded to any phone, anywhere in the world.