Tandem Chat is a free virtual office application designed for Android users by Tandem Communications. It connects your distributed team and allows you to see who’s around, talk, and collaborate in one click.

The mobile version of Tandem Chat lets you join audio-first calls while you're on the go and easily transition calls from your computer to your phone. You can view screen-share and video, making it easier to work remotely.

With Tandem Chat, you can hang out in always-on audio rooms and get into a conversation in just a couple of taps. No links, no ringing, and no waiting around. You can even wave at a teammate to see if they're free.

The application offers an automatic meeting room based on your calendar events, so there's no more hunting for links. You can join in Listening Mode while you take a walk and see your upcoming meetings and who's already participating.

Overall, Tandem Chat is an excellent application for businesses and teams that work remotely. However, it requires a Tandem account to use. If you're looking for an efficient way to communicate and collaborate with your team, Tandem Chat is worth checking out.