Guide22 Oct 2026 · 4 min read

Answering apps: what a cheap one does, and what it doesn't

The short answer

A cheap answering or voicemail app gives a missed caller a recording, or a "sorry I missed you" text, and that is better than silence. What happens next is still on you: the reply, the call back, the quote, the invoice, each somewhere else. Slate OS starts at the same moment and carries on: the caller's reply lands on your phone as a job, with their number and what they need, and the quote, the invoice and the payment are in the same place when you get to them.

What a cheap answering app does well

Answering and voicemail apps for small firms are cheap and quick to set up. Most give a missed caller a recorded greeting, turn their voicemail into text, and some send a short text saying you will be in touch. If all that was ever missing was a polite message, one of these, or a good voicemail greeting of your own, will do.

Where it stops

The message is the end of what it does. The caller's reply, if they send one, usually arrives as a text among your others. You ring back, agree the job, then write it down somewhere, quote it from somewhere else, invoice it from a third place and chase the money from your bank app. The answering app saved the call; the job is still on bits of paper.

And a recording only works on people who will leave a message. In the YouGov survey for Answer4u, only 6% of UK adults said they would.

Side by side

A call you miss
A cheap answering appA greeting or voicemail; on some, a short text
Slate OSA text from your firm within seconds, asking what the job is and where
Their reply
A cheap answering appA text among your others
Slate OSOn your phone with the missed call, as a job
Then
A cheap answering appUp to you, in whatever you use
Slate OSQuote, invoice and card payment from the same job, on your phone
Getting paid
A cheap answering appNot its job
Slate OSA card link on the invoice, or your bank details; the job marks itself paid with Stripe
Price
A cheap answering appA low monthly fee
Slate OS£249 a month, the line, calls and texts included

When an app is enough

If your jobs already run smoothly in something else and you only want a polite message, an app is fine. If the missed call is where the job starts going wrong, and the paperwork is where it ends up in a mess, Slate runs it from the missed call to the payment, from your phone.

Straight answers

Is a voicemail greeting enough?
For the few who leave a message, yes. In the YouGov survey for Answer4u, 6% of UK adults said they would leave a voicemail rather than wait. The rest are the ones a text holds.
Do I have to use the job tools?
No. Use them if you want, or just let the text-back run. They are there when the reply turns into a job.
What does Slate OS cost?
£249 a month, one plan. The first 25 firms pay £199 a month for as long as they stay. You get 14 days free from the day you start, and if you are not happy within 14 days of your first payment, you message us and we refund it in full.

Sources

Slate OS gives you an office line that rings your own mobile. When you can’t pick up, the caller gets a text in your firm’s name within seconds, and the job lands on your phone. Quotes, invoices and a diary come with it, for when you want them.