Note the glass insulators shining in the sun on the left ;-) It appears that the telephone circuits were strung above the electric lighting ones. This was common practice in the early (1910 and before) days so that they were at a safe distance from the higher voltage electric light wiring. In addition the telephone and electric utilities ran their circuits on separate poles for further safety. By the teens paired phone cable (replacing the exposed openwire) and electric utility standards provided safer means of delivering service to customers and thus it became commonplace in the US and Canada for utilties to share the same pole, with the electric wires on top.