Um, Like, You Know: How Rehearsing Out Loud With Mimicall Helps You Cut Filler Words and Fix Your Pacing

You know exactly what you meant to say. Then you say it out loud, and what comes out is "So, um, basically, like, I was just, you know, wondering if maybe..." If that sounds familiar, you are not unusual, and you are not unprepared. You have simply never heard yourself talk. Mimicall, an AI phone call app, gives you a way to do that: you set up a persona, receive a real call, and talk it through, so the words you rehearsed in your head get tested in the one place they have to work, out loud.

This post is about a very specific, underrated use of an AI phone call app: noticing and fixing how you speak, not just what you say. Filler words, rushed pacing, trailing sentences and apologetic openers are habits, and habits respond to practice.

Key Takeaways

• Most people have no idea how often they use filler words, because speaking happens faster than self-monitoring.
• Reading a script silently is not rehearsal. Speech is a motor skill, and it only improves when you actually speak.
• A phone call with an AI persona gives you low-stakes repetitions with a listener who never gets bored or judges you.
• Short, repeated practice calls beat one long session.
• The goal is not to sound like a robot or a newscaster. The goal is to sound like the clearest version of yourself.

Why do we say "um" and "like" in the first place?

Fillers are not a character flaw. They are what happens when your brain is planning the next phrase while your mouth is still finishing the last one. Linguists often describe them as a way to hold the floor while you think. Conversational speech is produced in real time, with very little room for editing, and a filler is simply a placeholder for the pause you are afraid to leave empty.

The trouble is not that you use them. The trouble is that you do not hear them. When you rehearse silently, your inner voice is fluent, tidy and unhurried. The moment you speak aloud to a real person on the phone, your brain is juggling content, tone, and the anxiety of being evaluated. That is when fillers multiply.

The fix is exposure. The more times you have already said a sentence out loud, the less planning your brain has to do mid-sentence, and the fewer placeholders it needs.

Can an AI call my phone and help me practice speaking?

Yes. That is what Mimicall does. You build a persona with a personality, a backstory and a speaking style, pick an AI voice, and Mimicall places a real phone call to your verified number, either instantly or at a time you schedule. There are more than 50 persona templates to start from, and new users get 10 free credits, enough to try several short calls and see whether the habit sticks.

Under the hood, a call like this combines several pieces of conversational AI. Your speech is transcribed by speech recognition, a large language model (LLM) decides how the persona should respond, and text-to-speech (TTS) turns that reply into a natural voice. Modern conversational AI can respond quickly enough that the exchange feels like talking to a person rather than waiting on a machine, and that is exactly what makes it useful for practice: your body reacts to it the way it reacts to a real call.

A phone call is also the right format for this. There is no screen to read from and no chat box to retype your answer in. Voice AI forces you to produce speech in real time, which is the skill you actually want to improve.

What does a "speaking habits" practice call look like?

Here is a simple structure you can reuse. It takes about ten minutes.

1. Pick a low-stakes topic. Not the big presentation. Something ordinary, like explaining your job to a stranger or describing your weekend.
2. Choose a patient persona. A calm, curious listener works well. Give the persona a brief like "ask follow-up questions and never interrupt."
3. Tell the persona what you are practicing. For example: "I'm working on pausing instead of saying 'um.' Let me finish my thoughts."
4. Talk for three to five minutes. Answer questions in full sentences. When you catch yourself reaching for a filler, try leaving a short silence instead.
5. Debrief out loud. At the end, ask the persona how it felt to listen. Was anything unclear? Did you speed up at the end?

The point is not perfection. It is a loop: speak, notice, adjust, speak again.

Is a silent pause really better than "um"?

Almost always, yes. A confident pause of one or two seconds sounds thoughtful to the listener. To the speaker it feels like an eternity, which is why people rush to fill it. A useful fact about voice and conversation: a pause that feels endless to you is usually barely noticeable to the person listening.

Practicing pauses is the single most effective change, and it is easy to do with an AI persona precisely because the persona is built to wait. A human friend might jump in to rescue you. A well-configured persona lets the silence sit, and you learn that nothing bad happens when it does.

How do you slow down when nerves speed you up?

Pacing is the other half of the problem. Nervous speakers accelerate, usually without noticing, and the end of every sentence gets squashed. Three small habits help:

• Breathe at punctuation. Imagine a comma or full stop and take a tiny breath there.
• Land the last word. Many people let the final word of a sentence fade. Practice finishing sentences with a clear, slightly lower tone.
• Aim for a conversational pace, not a slow one. Slowing down too much sounds unnatural. You want relaxed, not robotic.

Ask your persona to flag it gently if you start to rush. You can write that into the persona's speaking-style notes in advance: "If the caller speaks very quickly, calmly say, 'Take your time.'" That one instruction turns a generic call into a coach.

Who gets the most out of this?

• People with a big conversation coming up. Interview, pitch, presentation, difficult talk. The speaking habits you build in a casual practice call carry into those moments.
• Non-native speakers. Repeating real phone-call phrasing aloud builds fluency, and an AI listener never sighs when you search for a word.
• Remote workers. If most of your day is chat and email, your spoken muscles get little exercise. A short call keeps them warm.
• Anyone who dislikes the sound of their own voice. Hearing yourself speak at length, in a safe setting, is the fastest way to get comfortable with it.

Why not just record myself?

Recording yourself is useful, and you should do it too. But a recording has no response. You talk into the void, and the pressure that creates fillers in real life is missing. Conversation is interactive, and practice only transfers when it resembles the real situation. An AI phone call responds, asks questions, and occasionally surprises you, which is the closest you can get to the real thing without involving a real person.

Text-based AI companions cannot do this at all. Typing lets you edit before you send, so the very habits you want to change never show up. Voice AI exposes them.

How often should I practice?

Short and frequent beats long and rare. Three five-minute calls in a week will do more than one forty-minute session you dread. Scheduling helps: set a Mimicall call for the same time each day and treat it like a standing appointment. Over time you may notice your fillers shrinking, not because you tried to suppress them, but because you stopped needing them.

A few small things to track after each call:

• Did I pause instead of filling the silence at least once?
• Did I finish my sentences clearly?
• Did I speak a bit more slowly than I did last time?

Keep it that simple. Self-criticism is the enemy of speaking confidence.

FAQ

Can an AI call my phone for speaking practice? Yes. With Mimicall you create a persona, choose a voice, and receive a real call to your verified number, either right away or at a scheduled time.

Will it correct my filler words automatically? Mimicall is a conversation partner, not a transcript grader. You can brief your persona to listen patiently and give gentle feedback when you ask for it, and you can reflect on the call yourself afterward.

How much does it cost to try? New users receive 10 free credits, which is enough to run a few short practice calls before deciding whether it is useful for you.

Is a practice call with an AI really helpful if I know it is not a real person? Surprisingly, yes. Your body responds to a voice on the phone whether or not you know it is synthetic, and that response is exactly what you need to practice with.

Start with one short call

You do not need to overhaul how you speak. You need to hear yourself, a few times, with someone patient listening on the other end. If you have been wondering whether an AI phone call app can help you sound clearer and more at ease, the quickest way to find out is to try one ten-minute call. Set up your first persona at mimicall.app, use your free credits, and let the phone ring. The words you have been rehearsing silently will finally have somewhere to go.