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AI receptionist, answering service or voicemail: what should pick up your phone?
Most small firms miss calls every day, and most callers who reach a voicemail don't leave a message. There are now four ways to cover the gap. They suit different businesses.
By the Unibound teamUpdated 5 min read
A plumber is under a sink. A solicitor is with a client. A letting agent's two negotiators are both on viewings. The phone rings, and the question of what answers it decides whether that caller becomes a customer.
For years the choices were voicemail or a telephone answering service. An AI receptionist and the missed-call text-back are now realistic alternatives. This guide compares all four for a UK small or mid-sized business.
What missed calls actually cost
You will see dramatic numbers on this. Most do not survive checking, so here is what the evidence supports.
- Small firms do miss a lot of calls. A UK study by Moneypenny of 300 micro businesses found a third failed to answer a test call. The often-quoted "62% of calls go unanswered" comes from a 2016 study of 85 US businesses, which is too small and too old to lean on.
- Callers rarely leave messages. In the same Moneypenny data, 69% of callers who reached voicemail hung up without leaving one.
- They don't try many times. BT Business research among 1,515 people at UK firms found customers try a maximum of twice, and a fifth call only once.
Two statistics to avoid: "85% of callers who can't get through won't call back" and "80% won't leave a voicemail". Both are repeated everywhere and neither traces to any study. The UK figures above are from 2014 and 2016 and from companies that sell call answering, so treat them as indicative. The direction, though, matches common sense: a caller with a burst pipe rings the next name on the list.
The four options
Voicemail
Free, and better than nothing for existing customers who know you. For new enquiries it mostly fails, because the caller has to do the work and trust that you will ring back.
Missed-call text-back
When a call goes unanswered, the caller automatically gets a text: sorry we missed you, how can we help? It is cheap, and it suits the many people who would rather type than talk. On its own it only opens a conversation; someone or something still has to hold it.
A telephone answering service
A person at an outsourced service answers in your company's name, takes a message and passes it on. Callers get a human voice, which matters to some and in some trades. The limits are that most services take messages and don't resolve anything, quality varies with who picks up, and cost rises with call volume and with evening and weekend cover.
An AI receptionist
An AI voice agent answers in a voice you choose. It can answer questions from your own information, take structured details, book into your diary if connected, transfer to a person and send a confirmation by text. It picks up instantly, at any hour, however many calls arrive at once. Its limits are those of AI calls generally: exact details such as spellings need care, and some callers will want a person.
How they compare
| Voicemail | Text-back | Answering service | AI receptionist | |
|---|---|---|---|---|
| Caller speaks to someone | No | No | Yes, a person | Yes, an AI |
| Answers questions | No | If something replies | Rarely, beyond basics | Yes, from your material |
| Books appointments | No | If something replies | Sometimes | Yes, if connected to your diary |
| Evenings and weekends | Yes | Yes | Usually extra | Yes |
| Several calls at once | Yes | Yes | Depends on staffing | Yes |
| Urgent call reaches you now | No | No | If agreed | Yes, by transfer or alert |
| Cost | Free | Pence per text | Per call or per minute, plus a monthly fee | Per minute, plus a platform fee |
| Record of the call | A recording | The thread | A written message | Full transcript and captured details |
We have left prices out of the table because they vary too much to state fairly. For how AI call pricing works, see what an AI voice agent costs in the UK.
When a person must answer
An AI receptionist should not be the only thing between a caller and your business. Route these to people by rule:
- Emergencies and safety. A gas smell, a flood, a locked-out tenant at midnight. The AI can take the address while it alerts whoever is on call, but a person must be told at once.
- Distress and vulnerability. Bereavement, a caller who is confused or upset, anything a regulated firm would treat as a vulnerable-customer case.
- Complaints. A person who is already unhappy should not have to argue with software.
- Existing high-value relationships. Your biggest client probably expects to reach someone they know.
- Anyone who asks. In Five9's 2026 survey, trust in AI to resolve an issue was 26% with no human option and 55% with one.
Preference also varies with age. YouGov found the phone was the preferred way to reach a company for half of the oldest generation and 16% of Gen Z. If your customers are older, weight your set-up towards people.
The layered set-up
You don't have to pick one. The arrangement that loses fewest callers uses each option where it is strongest:
- In opening hours, ring your team first. Everyone at once, or in turn.
- If nobody picks up in a few rings, the AI answers. It deals with what it can and takes details for the rest.
- Out of hours, the AI answers straight away and books a call-back for the morning.
- Urgent calls alert the person on call by text or phone, at any hour.
- Every caller gets a text confirming what was agreed, and anyone who hangs up early gets a text-back.
- The team starts the day with a queue of call-backs, each with its transcript.
Questions to ask before you buy an AI receptionist
- Can I hear it on my own phone, with my own business details, before I pay?
- Can it ring my team first and only answer when they can't?
- What does a caller hear if they ask for a person at 8pm?
- What does my team see the next morning?
- Can it send a text after the call?
- Can I keep my number?
- Is it priced in pounds, and do I pay for calls that hang up straight away?
- Where are recordings and transcripts stored, and for how long?
Which to choose
A few calls a week, mostly from people who know you: voicemail with a text-back and a habit of ringing back within the hour is enough.
Steady enquiries, and a team that is often on the tools or with clients: an AI receptionist behind your own team, with a call-back queue.
A practice where every caller expects a human voice: an answering service in hours, and consider AI for out-of-hours only.
High volumes or several departments: call routing with AI as overflow, and reporting on what was missed.
If the second or fourth describes you, that is what Unibound's AI receptionist does, with handover to your team built in.
Questions people ask
What is an AI receptionist?
An AI voice agent that answers your business phone. It greets callers, answers common questions from information you give it, takes messages and details, books appointments and can transfer the call to a person. It works at any hour and can take several calls at once.
Is an AI receptionist better than an answering service?
It depends on the calls. An AI receptionist is available instantly at any volume, can answer questions and book, and costs by the minute. A good answering service offers a human voice, which some callers and some situations need. Many firms use AI for routine and out-of-hours calls and people for the rest.
Can an AI receptionist use a UK number and a British voice?
Yes. It can answer on a UK geographic or mobile number, and current platforms offer a range of British voices and accents. In Unibound you can also design a voice from a description. Always listen on your own phone before going live.
Is it legal to text someone back after a missed call?
A text that simply responds to their call, such as saying you are sorry you missed them and asking how you can help, is a service message and generally fine. Adding promotion makes it marketing, which needs consent or the soft opt-in under PECR. Keep the first message to the matter they rang about.
Do callers hang up when they hear an AI?
Some do, and the evidence on how many is thin and comes mostly from vendors. What reliably helps is saying straight away who they have reached, that it is an AI assistant, and that they can ask for a person at any point.
Sources
- Moneypenny, small business call report (November 2016). moneypenny.com
- BT Business, research on the cost of missed business calls (November 2014). mynewsdesk.com
- 411 Locals, small business owners don't answer 62% of phone calls (January 2016). 411locals.us
- Ofcom, experiences of suspicious calls, texts and app messages (2024). ofcom.org.uk
- YouGov, a deep dive into British customer service preferences (April 2025). yougov.com
- Five9, Consumer CX Report (October 2026). five9.com
- ICO, guidance on electronic mail marketing. ico.org.uk
