For a few years now, Apple has allowed you to send short disappearing voice messages through the messages app. I started sending some messages to the girls I'm dating with the voice feature, and the response has been extremely positive. One girl straight up said she likes hearing my voice. Another girl said I'm the only person that has ever sent her a voice message and she loves it.

Before you do this, make sure your voice fundamentals are where they need to be: check the codex for the voice tips. Avoid ums to the best of your ability. I also recommend sending texts periodically instead of exclusive voice messages, because when they disappear, it looks like a completely one sided text convo and girls might be put off by that.