How to communicate with colleagues remotely?

If you freelancer it meansб that you work where you want and when you want. It's good? Yes.

But is it so simple? And if you need to contact a colleague , but he is far from computer ? And if you have a little Padawan , how to help him?

As in the office , remote work tester implies tight communication with colleagues

How can organize work? What are the possible complications? What feature of the interaction?

All this I will try to explain in its report.