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Glossary · Numbering

What is Daytime phone number?

  • Also called: daytime contact number, daytime telephone

Reviewed by Sujan ThapaliyaLast updated

Definition

A daytime phone number is the number where you can be reached during working hours, as opposed to an evening or home number. The field survives on forms from an era when most people had a landline at work and another at home.
The three STIR/SHAKEN attestation levels, which underpin how daytime phone number behaves in practice: A asserts both that the carrier knows the customer and that the customer may use the calling number, B asserts the customer only, and C asserts neither. A shared number pool can reach B at best, which is why number ownership keeps recurring in these definitions.
Attestation is the backdrop to most caller-ID and deliverability terms, daytime phone number included.

In practice

How daytime phone number actually works

On modern forms it usually means a mobile, since one number covers both. Supplying a number nobody answers during the day defeats the purpose of the field.

For organisations collecting it, the distinction still matters where calls have to be made within business hours — appointment confirmations, deliveries, anything regulated by calling-window rules.

Where a business is calling consumers, the calling-hours rule is set by the recipient's local time regardless of which number was supplied.

For the organisation collecting it, the field is also a consent boundary worth respecting. A number given so a delivery driver can reach you during the day is not permission to call it for marketing in the evening, and treating the two as the same number for all purposes is how a helpful field becomes a complaint.

Worked example

A landline that rings an empty desk fails the field's only purpose. If a mobile is the number you actually answer between nine and five, that is the daytime number.

Daytime phone number: common questions

What should I put as a daytime phone number?
The number you will actually answer between roughly nine and five — for most people now a mobile. The field is asking about availability, not about which line you own.
Is a daytime number the same as a work number?
Historically yes, in practice no longer. It means reachable during the day, whether that is a work line, a mobile or a home number where you work.
Why do forms still ask for it?
Because organisations that need to call within business hours want a number that will be answered then, particularly where calling-window rules apply to when they may ring at all.

Sources

  1. Combating Spoofed Robocalls with Caller ID Authentication — Federal Communications CommissionThe STIR/SHAKEN framework, the attestation levels carriers sign calls with, and the mandate requiring providers to authenticate caller ID.
  2. 47 U.S.C. § 227 — Restrictions on the use of telephone equipment — Cornell Legal Information InstituteThe Telephone Consumer Protection Act itself — the consent requirements, calling-hours limits, and private right of action.
  3. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

See daytime phone number in the product

A call queue holds inbound callers in order and distributes them to whichever agent frees up next, instead of ringing one phone and failing. A callback option lets the caller keep their place and hang up, which is what actually reduces abandoned calls.

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