The telephone allowed for voice communication over a distance.
Explanation:
Telegraph can only be used to send text messages. It's commonly used by the people in the past for formal matters (such as send letters and business documents.)
Telephone can be used for voice communications. It's more commonly used for long-distance private conversations rather than something formal.
Telegraph is not as popular today due to the invention of a more efficient methods (emails or clouds). Telephones on the other hand, still widely used by the people worldwide.
