How does speaker justify his joy of having a telephone?

The speaker justifies his joy of having a telephone by highlighting the convenience and connectivity it provides, allowing him to easily communicate with loved ones and access information. He emphasizes the sense of security and immediacy that comes with being able to reach out to others at any time. Additionally, the telephone serves as a bridge to the outside world, enriching his daily life and fostering relationships. Overall, it represents a vital tool for enhancing both personal and social connections.