Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
3CX - Hosted PBX with CRM integration and mobile apps
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.
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.