What are some alternatives?
When comparing Vitelity and WhatsApp, you can also consider the following products
Eir SIP Voice - eir SIP Voice is revolutionizing the core communications tool of business that carries both calls and data over just one connection.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
BVoIP - BVoIP allows to easily add Cloud & On-Premise VoIP PBX to the product offering without having to re-invent the wheel or add another layer to the daily operations..
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.