If you're constantly leaving your desk, office or home office then RingCentral could be essential by keeping you connected to your customers and stay in the loop with your coworkers.

RingCentral can be setup on both a office landline and a mobile phone as an app.  So if you need to leave your desk behind you'll continue to get your office calls redirected to your phone so you can stay connected without having to either have a secondary work cell phone or give out your personal phone number.

Either on the desktop or mobile app you can send Instant Messages to your coworkers, text messages to customers, and receive faxes from your clients.