I thought this was interesting since it was at the cusp of the changeover to direct digit dialing with telephones. The ad promises you can complete some of the call yourself, but an operator is still needed. The text is fuzzy and hard to make out, so I'll transcribe it below, best I can. Mistakes are on me!

Here's Allen Sherman's parody song about digit dialing! His line about another phone company was funny because at the time, there wasn't another one.

Ad text,

Dial "112" to connect you with the equipment. Dial the "area code" to get your distant city ("415" for San Francisco, for example). Then, simply dial the two letters and five figures of the out-of-town number you want. Before the phone there starts to ring, the Operator will ask for the Complete number of the phone you're using - FLeetwood 2-9981, for instance.

Area code numbers, plus complete dialing instructions are contained in the Blue Pages of your directory. In addition, those pages explain (1) if you should reach a wrong number, simply tell your Operator what happened to avoid being charged (2) that you can learn the out-of-town telephone number you want simply by asking your Operator for information in the distant city. No charge!