Will it text people already saved as customers?

You can scope it. Most setups let you send only to unknown numbers or first-time callers, so regular customers who would rather just get a call back are left alone.

Do I need a new phone number for this?

Usually not. If your business line can send and receive text messages, the reply comes from the number your customer already dialled. If it cannot, a linked texting number is used and calls still ring your normal phone.

Is it legal to text someone who just called my business?

Texting back a person who just called you is generally supportable because they initiated contact, but you still need to identify your business, honour STOP and opt-out requests, keep the message transactional rather than promotional, and register the number for A2P 10DLC messaging in the United States. Confirm the specifics for your situation with counsel.

What happens if someone replies after hours?

Set business-hours logic. An after-hours missed call gets a text that sets expectations for the next morning, replies queue in your inbox, and the daytime version promises a faster callback.

Missed-call text-back: how auto-texting missed calls recovers lost leads

The short version

New callers rarely leave voicemail or call back. A fast text keeps you in the running.
The message should name your business, acknowledge the miss, ask one question, and set a callback expectation.
Scope it to unknown or first-time numbers, register for 10DLC, and make sure a human actually works the replies.

Why missed calls cost more than they look

Phone-driven businesses — trades, clinics, driving schools, service shops — miss calls all day for ordinary reasons: after hours, on a job, already on the other line. An existing customer will forgive it and try again. A prospect who found you through a search or a referral will not. They have three other numbers in the tab, and the first business to respond usually wins the job.

Voicemail does not save you here. Most people under a certain age will not listen to a voicemail, let alone leave one, and a missed-call notification with no follow-up is just a reminder of a lead you lost.

How it works

The flow is simple:

A call comes in and is not answered within a set number of rings, or goes to voicemail.
Within a few seconds, an SMS goes out from your business number to the caller.
Their reply lands wherever you want it — your phone, a shared team inbox, or your CRM.
Optionally, the message includes a booking link so motivated callers can schedule themselves.

Everything after the first text is a normal conversation. The automation just buys you the time to have it.

What the first message should say

Short, human, and specific. It should name your business so the text is not mistaken for spam, acknowledge that they called, ask one question, and say when they will hear back.

Hi, this is Dan at Ridgeline Plumbing — sorry we missed your call. What do you need help with, and is this the best number to reach you? I’ll call you back within the hour.

Avoid the opposite: a long paragraph, no business name, no question, and no timeframe. A message with nothing to reply to gets no reply.

Setup options

Through your phone system

Some VoIP and business-phone providers include a missed-call auto-text feature. If yours does and your needs are simple, start there.

A dedicated tool

Several standalone products do missed-call text-back with a canned message and a basic inbox. Quick to switch on, limited in how much you can shape the routing and the logic.

A custom automation

Wiring your call log to an SMS API gives you control the packaged options don’t: different messages by time of day, routing by which line was called, logging every conversation to your CRM, suppressing known numbers. This is what Kada builds when the off-the-shelf version is too blunt. See how it works for a driving school.

Compliance basics

This is business messaging, so a few rules apply even though the customer contacted you first:

Identify your business in the first message.
Honour opt-outs. A reply of STOP must stop the messages.
Keep it transactional. Answer the enquiry; don’t turn the thread into marketing.
Register the number. In the United States, application-to-person SMS from a business needs A2P 10DLC registration or messages get filtered and blocked.

This is a summary, not legal advice. Text-message rules, including the TCPA, change and depend on your situation. Confirm your setup with qualified counsel.

Pitfalls

Texting regulars who would rather you just called — scope it to unknown numbers.
No human working the replies, so the conversation dies at message two.
Sending from an unregistered number and getting silently filtered.
Over-automating — a bot that tries to handle the whole exchange when the caller wanted a person.