Yay.com

Yay.com combines HD VoIP with blazing fast enterprise chat messaging to businesses on the move.
Take calls or use chat messaging to coordinate with your internal colleagues, partners, suppliers and clients. Send files instantly and organise teams with private secure group chats. Use threads to keep conversations focused and our powerful smart search to find what you need.
Simple and easy to use, the Yay.com app turns your phone into your enterprise hub, accessible from anywhere, anytime.
Join thousands of customers already using Yay.com's powerful features to achieve a complete unified communications solution. Empower your team to work from anywhere at anytime.