"Communication is not developed yet. People in the past have talked over the phone as a result, there is a problem. For example, the cost of the call or talk to each other, each time very expensive.
Early communication is not yet developed. People in the past have talked over the phone, resulting in a subsequent issue. For example, the cost of each call or talk to each other very expensive.
The communication was not developed. In the past it has to talk over the phone, resulting in problems. For example, the cost of the call or talk each other very expensive.