Google Hangouts is a great communication tool for your team.
Google Hangouts lets you send text messages, images, make video calls, and more. Google Hangouts is already built into your Gmail page but you can use it on most any device and it syncs your conversations up across them all. Make sure you download the mobile app on your phone and the Google Chrome Extension on your Chrome browser. https://chrome.google.com/webstore/detail/google-hangouts/nckgahadagoaajjgafhacjanaoiihapd
Check out this quick introduction video to learn a little more about it.