Do you include text during a phone call simulation?

If you have the audio and CC, then you probably don't need the full narration on screen in conversation bubbles.

However, you could include text for a few key sentences or phrases to emphasize what's happening. Sometimes that can be helpful, like by highlighting a particular question in a series of interview questions.

Switching up the views can help with a conversation too. Show both characters for a bit, then switch to a layout where you just show a close up of the current speaker. Switch their poses every time they talk, and switch the layouts periodically.

If it still seems too boring, maybe the conversation is too long or a single speaker is talking for too long without switching. Breaking up the monologues can help too.