What are some alternatives?
When comparing Signal and BVoIP, you can also consider the following products
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.
Riot.im - Open source interoperable collaboration app.
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