Missed call text back: reply to every missed call with a booking link

When you're on a roof or under a sink, calls go to voicemail and the caller rings the next company. An automatic text within a minute keeps the lead warm and gets you the details before you call back.

By The Workshaped Lab·Autonomy: act with approval·Prompt tested 14 Oct 2026
Business phone with SMS (e.g. OpenPhone, Google Voice, your VoIP)Booking linkAny chatbot
Who it's forPlumbers, electricians, HVAC, cleaners, clinics and any business where the person who answers the phone is often busy.
AutonomyAct with approval. Nothing is sent, posted or booked without a person.
TierQuick win
ProvenanceIdea, prompt tested on synthetic data.

The problem

Trades and small service businesses miss a large share of calls during jobs. Most callers don't leave a voicemail; they try the next name on the list. By the time you call back at lunch, the job is gone.

Why it works

Most business phone systems can already send an automatic reply to a missed call; the work is writing messages that sound like you, get the useful details (what, where, how urgent) and don't promise anything you can't keep. A chatbot is good at drafting and tightening those messages. Sending stays inside your phone system's own auto-reply, which you control.

The rule we build by: the model reads; code decides anything involving money, dates, matching or what's true; a person approves.

Step by step

  1. Check your phone provider supports missed-call auto-text (most VoIP apps do; some need a paid plan).
  2. Write the first text: who you are, that you'll call back, a booking link, and one question for urgent jobs.
  3. Write a short follow-up for replies that ask about price or availability, used by a person.
  4. Turn on the auto-text only during working hours; use a different message after hours.
  5. Log missed calls and replies; call back in order of urgency.
  6. Review a week of replies and tighten the wording.

Pitfalls to avoid

  • Texting without consent rules: US numbers need business texting (A2P 10DLC) registration with most providers, and opt-out wording ("Reply STOP").
  • Never quote a price or a time slot in an automatic text.
  • Don't auto-text numbers you've blocked or existing customers mid-dispute; use your provider's exclusion list.
  • Emergency trades: tell callers to phone again or call 911 for gas leaks or flooding, not to wait for a text.

Free · Kickstart prompt

Get a rough first version today

Paste this into Claude, ChatGPT or Grok with your own data. It gets you a useful first pass, not the tested setup.

I run a [TRADE] business in [AREA]. When I miss a call, my phone system can send one automatic text.
Write me:
1. The automatic text (under 300 characters): my business name, that I'm on a job and will call back within [X hours], my booking link [LINK], one question to understand the job (what's wrong and the address), and "Reply STOP to opt out".
2. An after-hours version that says when I'll call back and what to do in an emergency.
3. Three short replies I can send by hand when someone answers: asking about price, asking for the earliest slot, and an emergency.
Rules: friendly, plain words, no exclamation marks, no promises about price or exact times. Then list anything in these messages that might break texting rules where I am, so I can check it.
Check every result by hand. Don't paste account numbers or anything you don't need to share.

✓ Prompt tested 14 Oct 2026: we ran it with gpt-5-mini on a synthetic sample and checked the output by hand.

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