UIFN (Universal International Freephone Number) is one toll-free number in the format +800 plus 8 digits that works in every participating country; ITFS (International Toll-Free Service) gives you a separate national toll-free number in each country, such as an 0800 number in the UK and a 1-800 number in the US. Choose UIFN for one memorable global number, ITFS for familiar local formats and wider reach.
What is a UIFN number?
A UIFN is a global freephone number defined by the ITU-T (Recommendations E.169.1 and E.152). It uses the country code 800, followed by an 8-digit Global Subscriber Number, for example +800 1234 5678. The same 8 digits are reserved worldwide for one company, so a customer in any participating country dials the international prefix, then 800 and the same 8 digits. The ITU's Telecommunication Standardization Bureau acts as the registrar, and only a recognised operating agency (a telecom operator) can apply on behalf of the customer, for a fee set by the ITU.
The number then has to be activated in each country by operators that support the service. Coverage is not universal: some countries and some mobile networks do not route +800 calls, and callers from those places cannot use it.
What is an ITFS number?
ITFS is a commercial service, not a single numbering standard. A provider gives you a domestic toll-free number in each country you choose, in that country's own format, and routes the calls to your contact center abroad over its network or SIP trunk. Your US customers dial a 1-800 style number, your UK customers an 0800 number, and so on. Each country has its own number, its own rules and its own per-minute cost.
UIFN vs ITFS: what are the differences?
| UIFN | ITFS | |
|---|---|---|
| Number | One number (+800 xxxx xxxx) for all countries | A different national number per country |
| Format for callers | International prefix + 800 + 8 digits | The usual local toll-free format |
| Who assigns it | ITU registrar, through an operator | The national operator or regulator, through the provider |
| Coverage | Only participating countries and networks | Most countries that have a toll-free range |
| Mobile access | Varies; often limited | Varies by country and operator |
| Recognition by callers | Lower; the format is unfamiliar to many | High; looks like a normal free local number |
| Marketing | One number on all global materials | A list of numbers per country |
| Setup time | Longer: global reservation plus activation per country | Per country, often faster |
Which should you choose?
- UIFN suits brands that want one number printed on products, cards or apps used in many countries, and whose customers mainly call from fixed lines in participating countries.
- ITFS suits customer service where reach matters most: callers recognise the local format, and coverage of mobile callers is usually better.
- Both together is common: UIFN as the global number, with ITFS numbers in key markets where +800 is not reachable.
How are toll-free calls routed and billed?
With both services, the caller pays nothing and you pay per minute for each inbound call. Rates depend on the origin country and on whether the caller uses a fixed line or a mobile phone; calls from mobiles usually cost more. The provider delivers the calls to your system as inbound DIDs over a SIP trunk (see what is a DID number and what is SIP trunking). In wholesale terms this is origination, not termination (see origination vs termination).
Toll-free lines are a target for traffic pumping: calls generated only to earn a share of the inbound fee. Set alerts on unusual volumes by origin and on many short calls, as described in revenue share fraud and short duration calls.
Outbound routes for your contact center
Toll-free numbers bring calls in; your agents still need routes to call customers back. VoIPMatcher sources VoIP termination routes from its carriers and manages them for you. Request a VoIP route for the countries you serve.
Frequently asked questions
What does UIFN stand for?
UIFN stands for Universal International Freephone Number. It is a toll-free number with the global country code 800 followed by 8 digits, defined by the ITU-T and registered through the ITU's Telecommunication Standardization Bureau. The same number can be activated in every country whose operators support the international freephone service.
How do you dial a +800 number?
Dial your country's international access prefix, then 800, then the 8-digit number. From most of Europe that is 00 800 followed by the 8 digits; from the US and Canada it is 011 800 followed by the 8 digits. On a mobile you can usually type plus, then 800 and the 8 digits. Some networks do not connect these calls.
Is a +800 number free to call from a mobile?
Not always. The UIFN customer pays for the call, but some mobile operators do not route +800 numbers at all, and others may apply their own charges. If many of your customers call from mobiles, test access in each key country and consider adding national ITFS numbers there.
What is the difference between ITFS and a local number?
An ITFS number is a toll-free number in the target country, so the caller pays nothing and you pay for each inbound minute. A local geographic number is charged to the caller as a normal local or national call, and usually costs you less per minute. Many companies offer both.
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