Which departments use the 03 number?

The 03 area code covers a vast regional area in north-eastern France. It designates landline telephone numbers in three major regions: Hauts-de-France, Bourgogne-Franche-Comté and Grand Est.
Here is the list of corresponding departments:
- Hauts-de-France: Aisne, Oise, Somme
- Bourgogne-Franche-Comté: Doubs, Jura, Haute-Saône, Territoire de Belfort, Côte-d’Or, Nièvre, Yonne
- Grand Est: Ardennes, Marne, Bas-Rhin, Haut-Rhin, Meurthe-et-Moselle
Telephone numbering in these areas follows the international +33 3 format, validated by the regulatory authority.
The advantages of a number beginning with 03
An 03 area code offers many advantages for your company:

Strengthening local roots
The 03 area code is used to :
- Clearly identify your presence in the Northeast region
- Get closer to your local customers
- Create an image of trust for your prospects
National and international accessibility
Your home phone number :
- Corresponds to International Telecommunication Union standards
- To be reached from abroad with the prefix +33
- Works on all types of networks (mobile and fixed)
Flexibility of use
Modern mobile telephony offers you :
- The possibility of changing the regional code in the event of a move
- Use on different devices (landline, mobile, app)
- Simplified management of your business communications
How to use an 03 number effectively

For your customer relations
An 03 number strengthens your local presence in the Bourgogne-Franche-Comté and Hauts-de-France regions. Your customers can reach you at no extra cost, thanks to the plans of the main telephone operators (Orange, SFR, Bouygues, Free). This national and international accessibility facilitates exchanges with all your contacts.
For your prospecting campaigns
The 03 area code significantly improves the effectiveness of your telephone campaigns. Prospects immediately identify the local origin of your calls, which increases the response rate. This strategy enables you to target your sales actions precisely by department.
To manage your communications
Portability guarantees that you keep your number even if you change operators. A centralized interface simplifies consultation and management of all your calls. The blocking system provides effective protection against unwanted numbers and scam attempts.
Activate your virtual number 03
Kavkom lets you quickly obtain a national 03 number for your company online, in just a few clicks. Our flexible telephony platform adapts to all your needs:

Instant activation
Your line is activated immediately, with no obligation. You can choose your area code from the available departments. Our customer service team will help you every step of the way.
A complete solution for your business
Our cloud telephony software includes all the essential features:
- Interactive Voice Server (IVS) for intelligent call routing
- Click-to-call to trigger calls from your web browser
- Integrated CRM for tracking all your customer communications
- Call recording for optimal quality control
This solution integrates naturally with your existing tools:
- Direct connection to leading CRMs: Hubspot, Zoho, Salesforce, etc.
- Mobile applications to stay in touch everywhere
- Compatible with all IP telephony systems
Centralized interface simplifies management:
- Dashboard to view activity in real time
- Detailed statistics on your communications
- Intuitive configuration of your routing rules
Transparent, competitive rates
Our offer includes all essential voice services with no hidden costs. The numbering plan adapts to your budget and communication needs.
Advanced features included

Intuitive configuration
Our virtual telephony solution offers :
- Installation in 5 minutes with no technical skills required
- Simplified configuration of your calling rules
- Interface accessible from any connected device

Powerful communication tools
Advanced features allow you to :
- Easily block unwanted calls and cold calling
- Locate the origin of incoming calls
- View communication statistics in real time

Comprehensive supervision
Kavkom helps you :
- Display your team’s performance indicators
- Efficiently track your prospecting campaigns
- Control call quality with recording
Frequently asked questions about the 03 area code
What is the 03 area code in France?
03 is the telephone code for the Nord-Est region. It designates landline telephone numbers covering a geographical area from Territoire de Belfort to Hauts-de-France.
How do I identify an 03 number?
Numbers beginning with 03 are easily identifiable. Their origin is local and corresponds to northeastern France. Beware, however, that some calls may be cold calling.
Which departments use the 03 area code?
The 03 area code covers the departments of two large regions:
- In Bourgogne-Franche-Comté: Côte-d’Or, Doubs, Jura, Nièvre, Haute-Saône, Saône-et-Loire, Yonne
- In Hauts-de-France: Aisne, Nord, Oise, Pas-de-Calais, Somme
How do I change the code of an 03 number?
VoIP telephony offers total flexibility for managing your numbers. Kavkom lets you :
- Change area codes easily
- Add virtual numbers with different codes (01, 02, 03, 04, 05)
- Keep your existing number with portability
This means you can tailor your telephone presence to suit your needs, without any service interruptions or complex dealings with traditional operators.
What types of 03 numbers are available?
According to the French numbering plan, a distinction is made between :
- Business fixed-line numbers for companies
- Mobile lines associated with a fixed-line number
- Virtual mobile telephony solutions
How much do calls to 03 cost?
Calls to 03 numbers are included in standard telecom packages. There are no additional costs, unlike for special numbers.
Would you like to activate an 03 number? Contact us for a free demonstration of our solution!
