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Global UIFN Numbers,
One Number Worldwide

Tellimon lets your customers reach you from multiple countries with one simple 00800 toll-free number.

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Universal International Freephone Numbers (UIFN)

Introducing UIFN — the simplest way to create a truly global toll-free presence. Instead of managing multiple numbers across different countries, Tellimon lets you use one single 00800 number that works internationally.

UIFN makes communication effortless. With one easy-to-remember toll-free number, customers from anywhere in the world can reach your business without confusion or extra steps.

For brands serving global audiences, this is a game-changer. Whether your customers are in New York, Tokyo, or Paris, they only need one number to connect with you — no local variations, no country-specific formats.

To explore where UIFN is supported, check our coverage page. You can also find detailed usage information in our product sheet and pricing guide.

Interested in how Tellimon can help your business expand globally with UIFN?
Get in touch with us today and discover new opportunities for seamless, worldwide customer communication.

00800 UIFN

Tellimon provides global 00800 Universal International Freephone Numbers, giving your business one toll-free number that works across multiple countries.

ITU Registration

We handle full ITU registration on your behalf, ensuring your UIFN is assigned correctly and ready for global activation.

Number Porting

Already have a UIFN? Tellimon can port your existing number and expand its reach into more supported countries.

60+ Countries

Activate your UIFN in 60+ countries and make your business universally reachable through a single, easy-to-remember number.

Universal International (UIFN) Explained in Detail

UIFN vs. ITFS / 0800

The key difference between an ITFS (International Toll-Free Service) number and a UIFN is reachability.
While ITFS numbers work only within a single country, a UIFN can be activated across multiple countries, allowing you to advertise one single toll-free number globally.
In most regions, customers can dial your UIFN using 00 800 or +800 followed by your number.
(Refer to our product sheet and price list for region-specific dialing formats.)

Assignment & Activation

UIFN numbers are assigned by the ITU (International Telecommunication Union) directly to the end user — meaning you fully own the number.

Tellimon can help you with ITU registration or manage the entire process on your behalf with no added markup on ITU fees.

During setup, you simply select the countries where your UIFN should be active.
Activation in a country means callers in that region can reach your UIFN. As your business grows, you can easily request activation in additional countries.

Thanks to central ITU registration, no local address or presence is required, unlike many individual ITFS numbers.

Existing Numbers & Porting

If you already have a UIFN, Tellimon can:

  • Fully manage your number porting

  • Activate your UIFN in additional countries

  • Transfer existing activations to Tellimon for unified billing and full control

We can activate your current UIFN across new regions or consolidate all existing countries into our service, giving you one provider, one invoice, and a single platform to manage everything.

UIFN Reachability

UIFN reachability depends on commercial agreements with local telecom operators.
Tellimon handles all carrier relations, ensuring this never becomes a burden for you.

In some countries, not all operators may support UIFN or may apply airtime charges to the caller. Tellimon provides full transparency and lists all known limitations or charges in our documentation and pricing.

This ensures you always have accurate, up-to-date information to guide your customers.

All Information in One Place

To make choosing between ITFS and UIFN simpler, Tellimon consolidates all commercial details, reachability information, and activation differences into a single, easy-to-compare monthly price list.

This helps you clearly evaluate the best number type for every region.

How to Get Started with UIFN

Whether you need a new UIFN, want to expand activation into more countries, or want to move your existing UIFN to Tellimon, our team is here to help.

Contact our sales team to discuss your needs, pricing, and activation options.
Together, we’ll help you choose the most effective global toll-free solution for your business.

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