world war 1 phones to communicate

http://online.wsj.com/ww1/telecommunications 

Telephones and the Telegraph were the most used form of Telecommunication,both by civilians and by the military,when world war 1 was declared.Both were refined and made more secure during the conflict, while radio communication took great leaps forward.Ultimately,technologies developed for use on the front would lead to the creation of broadcast radio in the 1990s.

The  communication machine technology  was used to contact their air forces to. To

help them. And also used to call for backup. for some more troops.

When the First World War began the British war office seemed little initial attention to developed in the prosecution of hostilities.        

Here is some pictures of some more phones from world war 1