This explainer is written for telecom, IT and operations buyers — and for carriers sourcing numbers wholesale — not for consumers activating a second-line app. A virtual number, also called a DID (Direct Inward Dialing), is a public phone number provisioned online and delivered to you over the internet rather than tied to a single physical line on the PSTN (Public Switched Telephone Network — the traditional circuit-switched phone system). Because it is still a real telephone number, it sits inside a regulated numbering system.
That is why buying one sometimes involves KYC (Know Your Customer — identity and eligibility checks). This page explains the industry-wide model behind those checks: how numbering is allocated, why verification exists, and what to prepare. It is not a statement of any single country's law. Requirements differ market to market, and the exact requirement for a given number is shown at the point of order and on the relevant per-country page.
On this page
Why are phone numbers regulated?
Phone numbers are regulated because they are a finite national resource that has to be shared without collision or abuse. Each country's numbering plan is a limited pool, so a number range — a block of numbers sharing a defined prefix and type — is allocated deliberately rather than claimed freely. The allocation runs down a chain: the national regulator assigns ranges to licensed carriers, those carriers make blocks available to providers, and providers sell individual numbers to businesses. A geographic number is tied to a city or area prefix; a non-geographic number is countrywide and not linked to a locality. Both are drawn from that same allocated, accountable supply.
The practical consequence is that no provider owns numbers outright. It holds an allocation under conditions set higher up the chain, and it is answerable for how those numbers are used. Conditions that arrive with the range are passed on to whoever buys from it.
Why do providers ask for documents (KYC)?
Providers ask for documents to satisfy anti-fraud and consumer-protection conditions that arrive attached to the number range, not because the provider invented a hurdle. Numbering can be misused for fraud, nuisance traffic and caller-ID spoofing, so verification exists to tie a number to an identifiable, accountable holder. Because the requirement is a property of the range, it is the same for every compliant seller of that range.
What separates a good provider is not whether it asks — a compliant one always will where the range demands it — but when and how clearly it tells you. A good provider states the requirement on the number at the point of order, so you know before you buy whether a range activates instantly or needs paperwork, and handles any uploads in the portal rather than over email threads.
What are the requirement classes?
Requirements fall into a small set of classes. Which class applies depends on the country and the number type, and the exact class for any given number is shown when you order it. The table below describes the classes in general terms rather than mapping them to any particular market.
| Class | What is asked | Typical situation |
|---|---|---|
| None | No documents; the number activates as soon as it is ordered. | Ranges a regulator treats as low-risk; fast-moving markets. |
| ID only | Identification for the account holder or an authorised person. | Ranges needing a named, accountable holder but no location proof. |
| ID + proof of address | Identification plus a document evidencing a registered address. | Ranges where the holder must be traceable to a verified address. |
| Local presence | Evidence of an address or registered entity in the number's country. | Geographic ranges reserved for locally present businesses. |
| Varies by number type | Different classes apply to different types within one country. | A market that documents geographic numbers but not others. |
Why do the rules attach to number ranges, not providers?
The rules attach to the range because the range — its prefix, type and country — is what the regulator allocated with conditions in the first place. The obligation travels with the block of numbers, so it lands identically on every provider that resells that block. Two providers offering the same range apply the same check; there is no compliant version of that number that skips it.
This is the reason you cannot shop the requirement away. If one vendor claims a range needs no documents while every other vendor asks for them, the difference is not a better deal — it is a sign the number is mislabelled or being sold outside the rules, which puts the number and its call delivery at risk. The requirement is a fixed property of what you are buying, not a negotiable provider policy.
What should you prepare?
Prepare the documents that documented ranges commonly call for so activation is not held up waiting on paperwork. In practice that means a company registration document, identification for an authorised person, and a proof of address; some ranges additionally ask for a local address in the number's country. You will not always need all of these — many numbers need none — but having them ready covers the documented cases without a scramble.
The timing follows directly from the class. Undocumented markets activate the moment you order. Documented ones take a few business days while the paperwork is checked, and that window is shorter when complete, correct documents are submitted up front. Assembling the set once, before you order, means you can activate across markets without repeating the exercise per number.
Is compliance a burden or a benefit?
Compliance reads as a burden at the point of order but works as consumer protection that serious buyers benefit from. The same checks that ask you for a document are what curb fraud, nuisance calling and caller-ID spoofing across the numbering system. A range whose holders are all verified is a range that is trusted — by carriers who route it, by networks that terminate it, and by the people who receive calls from it.
For a business that intends to use its numbers legitimately, that protection is an asset rather than a cost. It defends the reputation of the ranges you operate on, keeps your traffic in good standing across the carriers that carry it, and separates accountable users from the throwaway numbering that verification is designed to filter out.
Requirements differ from one market to the next
Because every country runs its own numbering plan, the class that applies to a number differs from one market to the next, and it can differ by number type within a single market. Rather than restate rules that change, the accurate answer for any given country lives on its own coverage page, where the current requirement is shown against the numbers actually on offer. See what applies where for the United Kingdom, Germany, United States and France, or browse them all in the coverage table.