How Many Phone Numbers Are There? Everything You Need to Know About Area Codes, Toll-Free Numbers, and More
Our modern world relies heavily on mobile communication, but this digital society still has its roots in technology that’s generations old: telephone numbers. Whether you’re on a traditional phone call, texting a friend, or verifying your identity, our mobile phone numbers act almost like alternate forms of identification.
Have you ever wondered how many phone numbers there are in the world today? Will we ever run out of phone numbers worldwide or even in the same geographic region? Let’s discuss how phone numbers are allocated, the maximum number of possible phone numbers in our current system, how many are currently in use, and what this information means for you.
What Makes a Telephone Number?
Phone numbers are used worldwide to route communications to specific recipients. The United Nations’ International Telecommunication Union oversees phone numbers and other communications, as well as technology. Originally known as the International Telegraph Union when it was established in 1865, the International Telecommunication Union actually predates the UN itself, and it’s the oldest agency within the UN today.
All phone numbers in use today — including both fixed lines (landlines) and mobile phone numbers — must follow international standards, including the E.164 numbering format. This format defines phone numbers as having a maximum of 15 digits, including up to three digits as part of the country code. With the E.164 format, there is a potential maximum of 10 billion phone numbers for each country code. In other words, we’re not running out anytime soon!
The North American Numbering Plan
Each region of the world can have some nuance regarding how the rest of the numbers are used. For example, the North American Numbering Plan uses the country code “1,” followed by a three-digit area code. This area code system indicates the phone number’s exact geographical region — for instance, area code 307 indicates a phone number within the state of Wyoming.
The next three digits represent the central office code, formerly known as the exchange code. This three-digit segment used to indicate which telephone switchboard the call would dial. From there, operators would manually connect calls using pairs of wired cords on a switchboard. Today, this process is automated, but the three-digit central office code persists, at least in the North American Numbering Plan and several other regional systems.
The final four digits of a North American phone number are referred to as the “line number.” It refers to the exact device or telephone line that the local phone number belongs to.
Within the same North American area code, you technically only need to enter the central office code and line number to make a local call.
How Many Landline and Mobile Phone Numbers Are Possible in the World Today?
Of course, it’s impossible to nail down exactly how many phone numbers there are, but we can put together a reasonably accurate estimate. There are currently around 200 country codes in active use. While each country can allocate up to 15 total digits for its phone numbers, most don’t. In fact, typical countries use between eight and 12 digits per telephone number.
So, practically speaking, there are somewhere around 200 billion phone numbers possible in today’s currently used numbering system. Given that there are roughly 8 billion people in the world, it’s clear that not all 200 billion of those numbers are in current use.
How many phone numbers would be possible if every country used the full 15-digit maximum, and every one of the 1,000 possible three-digit country codes was in use? Overall, this system could spawn up to 1 trillion unique phone numbers!
How Many Phone Numbers Are Actually in Use?
There are currently around 9 billion mobile phone numbers around the world. Seeing as this is higher than the number of people currently living, many people have more than one number.
However, that’s just mobile numbers. What about fixed lines (also known as landlines)? While the popularity of landlines has dropped significantly over the years, there are still quite a few of these phone numbers in use. All told, there are about 800 million landline phone numbers in active use.
There are also virtual numbers to consider. Voice over Internet Protocol (VoIP) assigns traditional phone numbers to broadband internet subscribers who then use their phones over the internet, not traditional phone lines or cell networks. VoIP numbers are popular with small business owners who need separate personal and business phone numbers but don’t want to set up a new landline or mobile phone number. In addition, services like Skype add more virtual numbers to the total worldwide count of phone numbers.
It’s tough to estimate how many virtual and VoIP numbers are currently in use, but most experts have the number somewhere between 100 million and 300 million. So, the grand total of active phone numbers around the world is probably in the 10 billion range.
What Happens When We Run Out of Phone Numbers?
With “only” around 10 billion active phone numbers out of a potential 1 trillion, it’s clear that we’re nowhere near the point of running out of phone numbers on a worldwide scale. That said, certain major cities have started running out of eligible numbers within their area codes.
As an example, both Los Angeles and New York have had to create what’s known as “overlay area codes.” These are new area codes added to the existing ones for a given region. New York City had four area codes (347, 718, 917, and 929) until 2025, when the city added the new 465 overlay area code for new phone numbers in several neighborhoods, including the Bronx, Brooklyn, Queens, Staten Island, and part of Manhattan.
This new area code is only for brand-new phone numbers, and it does not interfere with Local Number Portability. The Telecommunications Act of 1996 introduced Local Number Portability as a way to make sure customers could switch phone companies without having to get a new phone number. Before that, you would have to change your phone number as part of the relocation process every time you moved!
What about in other countries? The only areas with the massive population growth necessary to run out of phone numbers anytime soon are China and India. Thankfully, both countries have already expanded their phone number systems to support the increased demand. For instance, India has ten-digit phone numbers and adds new area codes whenever it needs them.
How Is Technology Changing the Landscape of Phone Numbers?
New technologies are transforming the traditional phone number as we know it. For example, we already discussed VoIP phone numbers, which are online-only numbers that operate over WiFi or ethernet. Let’s review a few other ways that technology has changed the concept of phone numbers.
Phone Number Recycling
Phone number recycling has been around for decades, but its role has evolved in recent years. If a subscriber cancels their phone service or passes away, telecommunications providers typically recycle their number by reassigning it to a new customer after a grace period (usually 30 days).
The concept of phone number recycling has had its share of controversy over the years. Supporters say it helps cut down on the need to generate new phone numbers, while detractors say it results in increased spam calls and junk texts. In 2018, the Federal Communications Commission established the publicly accessible Reassigned Phone Numbers Database, which indicates whether a phone number has been reassigned to a new user.
Digital Identifiers
With the rise of two-factor authentication, phone numbers often serve as a sort of digital ID card. Two-factor authentication is frequently used to beef up the security of online accounts. For instance, if you’re trying to log into the banking app on your phone, the process starts with entering your unique username and password. However, after that step, there’s often an additional step that requires you to enter a code sent to you via text message. Thus, your mobile number is often also a virtual ID verifier.
eSIM (Embedded Subscriber Identity Module)
For years, physical SIM cards were necessary for a mobile phone to access its wireless carrier’s network. However, the development of eSIM technology has changed the game, as consumers can now swap between wireless providers without switching out any physical cards. This, combined with Local Number Portability, ultimately decreased the demand for new phone numbers, as it made it easier for consumers to transfer their existing numbers to new accounts or devices.
The Future of Phone Numbers
As we gaze into our crystal ball, there could be a need for new numbering systems in cities with high population density, much like we’ve already seen starting to happen in New York and Los Angeles. Today, this only takes the form of new area codes, but who knows what the future holds?
Perhaps there will be a new technological revolution that requires each person to have several distinct phone numbers. Maybe a new mobile protocol could take over, similar to the way the IPv6 internet protocol took over the realm of online IP addresses from the previous IPv4 protocol. It’s hard to tell where the future of phone numbers will take us from here, but we’re confident that the basic concept of phone numbers is here to stay one way or another!
In Conclusion
In the old days, you had to change your phone number just to switch from one wireless carrier to another (i.e., from AT&T to Verizon). More recently, you needed to pop out a physical SIM card to transfer your phone number from one device to another. Thankfully, today’s system is much more convenient, and it makes the process of selling your old devices to ecoATM far simpler.
If you want to sell your old phone for quick cash, you don’t need to jump through any complicated hoops to keep your phone number. Simply activate your phone number on your new device and perform a factory reset on your old one before bringing it to your local ecoATM kiosk.
From there, all you need to do is allow the kiosk to perform a diagnostic check on your phone and accept our cash offer. If you do, you’ll walk away with instant cash in your pocket — and you won’t even need to change phone numbers like you did in the old days!
