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How to write a callback request: templates for email, text, and WhatsApp plus a template for the internal callback note, ready to copy.
A callback request is a short message with four details: who wants the callback, what it's about, what number to use, and when it works best. It reads as polite through a request instead of a demand, for example: “Please call me back at [phone number], ideally today between 2 and 4pm.”
Below are 11 ready-made templates: four emails with subject lines, four short messages for text and WhatsApp, and three templates for an internal callback request to coworkers. Just replace the placeholders in brackets and you're done.
11 templates · email, text, WhatsApp, note · ready to copy
How do you write a callback request?
Name four things: who you are, what it's about, what number you're reachable at, and when the callback works best. The rest is tone: ask instead of demand, one sentence per detail, a thank-you at the end.
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Who wants the callback
Name and company, right at the start. Whoever has to guess who the message is from won't call back — they'll put it on the pile.
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What it's about, in one sentence
“It's about your quote from Tuesday” is enough. The other person can prepare, and the callback turns into a short conversation instead of a guessing game.
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The callback number, even if they already have it
The number belongs in the message, not in the other person's address book. Every second spent searching lowers the odds the callback actually happens.
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A time window you can actually keep
“Best between 2 and 4pm today” is an invitation, “whenever you get a chance” is a postponement. And if you name a window, you have to pick up during it.
Callback request by email: templates with subject lines
Email is the right channel when you can't reach someone by phone, or the callback isn't urgent. The subject line should name the topic, not just “Callback,” or the email gets buried in the inbox. Three short paragraphs are enough: what it's about, what number to use, and by when.
Subject: Callback request: [Topic] Hi [Name], I tried reaching you by phone but couldn't get through. It's about [topic in one sentence]. Please call me back at [phone number], ideally [day] between [time] and [time]. Thanks and best regards, [Your name]
Subject: Callback requested by [time]: [Topic] Hi [Name], I need a quick response from you on [topic], because [reason in one sentence]. Please call me by [time] at [phone number]. If I don't hear from you by then, [what happens next, e.g. I'll move forward without your notes]. Thanks and best regards, [Your name]
Subject: You called us: happy to call back, or just let us know a time Hi [Name], You tried to reach us earlier today, but we were on another call. You can reach us until [time] at [phone number]. Or just reply to this email with a time window and your number, and we'll call you. Best regards, [Your name], [Company name]
Subject: Quick reminder: callback request about [Topic] Hi [Name], A few days ago I asked for a callback about [topic] — it may have slipped through. You can reach me at [phone number], this week ideally [day] from [time]. Or just reply to this email, that works too. Best regards, [Your name]
Callback request by text and WhatsApp: short and specific
A text almost always gets read, often faster than any email. That means space is tight: sender, topic, number, time window, done. WhatsApp works the same way, just a touch more relaxed in tone with existing customers.
Hi [Name], this is [Your name] from [Company name]. I just tried to reach you. Please call me back at [phone number], ideally by [time] today. Thanks!
Hi [Name], this is [Your name] from [Company name]. It's about [topic], and it's a bit urgent. Please call me by [time] at [phone number]. Thanks so much!
Hi [Name], this is [Your name] from [Company name]. I have a quick question about [topic]. Could you call me back when you have five minutes? Reach me at [phone number], today by [time]. Thanks!
Hi [Name], thanks for calling [Company name]. We've noted your callback request and will get back to you at your number by [time]. If it's urgent, reach us at [phone number].
Callback request for coworkers: the internal note
Most callback requests start on the phone: someone calls, a colleague isn't at their desk, and the note left behind decides whether the callback happens. Six details belong on it, the same ones as a good set of call notes.
For a print-ready A4 form with these fields, see our call notes template as a PDF (in German) .
Callback for: [Colleague's name] Called: [Name, company] on [date] at [time] Request: [one or two sentences] Callback number: [phone number] Callback by: [time or date], priority: [urgent / normal / can wait] Taken by: [your name]
I've noted your callback request: [Name], it's about [request], reachable at [phone number]. [Colleague's name] will call you back by [time]. Did I get the number right?
Subject: Callback request: [Name, company] by [time] Hi [Name], [Caller's name] from [company] called at [time]. It's about [request in one sentence]. Please call back at [phone number], ideally by [time]. Thanks! [Your name]
Callback requests happen because nobody picked up.
Every callback request is a call that didn't get through. For your own business, that's fixable: an AI phone assistant answers the call whenever nobody can, asks for the name, the request, and the callback number, and captures the desired time window right along with it. The finished callback request lands sorted by email or in your CRM, instead of as a note by the phone. Other options are covered in the comparison on the Call Answering page.
Free and no obligation.
Frequently asked questions about the callback request.
How do I write a polite callback request?
With a request instead of a demand and a concrete time window, for example: “Please call me back at [phone number], ideally today between 2 and 4pm.” A callback request reads as polite mainly because it takes work off the other person's plate: the topic in one sentence, the number right in the message, a time window instead of “whenever.” A thank-you at the end costs nothing and leaves a good impression.
What should a callback request include?
Four things: who wants the callback (name and company), what it's about (one sentence), the callback number, and a time window that works. Miss one of them and the odds of a callback drop: no topic means the other person can't prepare, no number means they have to search, no time window means the request lands on the “later” pile.
How do I write a callback request by email?
With a subject line that names the topic (“Callback request: quote from Tuesday”) and three short paragraphs: why you're writing, what it's about, and at what number and by when you're reachable. Four ready-made email templates with subject lines are above on this page, from the standard case to a friendly reminder.
What do I text someone I can't reach?
Keep it short and complete: “Hi [Name], this is [Your name] from [Company name]. I just tried to reach you. Please call me back at [phone number], ideally by [time] today. Thanks!” It matters that the sender and number are both in the message — nobody calls back a text from an unknown number with no name attached.
How do I write down a callback request for coworkers?
With six details: who the callback is for, who called (name and company), when, what it's about, what number to use, and by when the callback should happen, plus who took the call. A fillable text template is above on this page; a matching printable A4 form is in our free call notes template PDF (in German).
Can an AI take callback requests automatically?
Yes. An AI phone assistant picks up when nobody can, asks for the name, the request, and the callback number, and captures the desired time window right along with it. The finished callback request arrives sorted, by email or in your CRM, with no sticky note and no voicemail someone has to listen to later. The templates on this page are then only needed when you're the one asking for a callback.
So the callback request is followed by an actual callback: the call notes template with phone script →
Last updated: August 30, 2026
Copy once, never search for words again.
Pick a template, replace the placeholders, send it. And if you ever want to stop leaving callback requests altogether and start missing fewer calls instead — there's a way for that too.
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