Calling a UK phone number from Ireland may seem complicated at first, but it’s straightforward once you understand the dialling codes, formats, and options available.
Whether it’s a landline or a UK mobile, international calling requires knowing the exit code, the UK country code 44, and the correct area code.
In this guide, we’ll explain everything in detail so you can easily make international calls from Ireland to the UK.
Understand International Dialling
What Is an International Dialling Code?
An international dialling code is a number you dial before the country code to connect your call internationally.
In Ireland, this is called the exit code, which is 00. Every country has a unique country code; for the UK, it is 44. Together, the exit code and country code allow your call to reach the correct country.
Why You Need the Correct Format?
Dialling the correct format ensures your call connects successfully. UK numbers start with a 0, which is a routing digit used within the UK. When calling from Ireland, this 0 is removed and replaced with the country code 44. The format looks like this:
- Landline: 00 + 44 – 0 + area code + landline number
- Mobile: 00 + 44 – 0 + 10-digit mobile number
Incorrect formats can result in failed calls or unexpected call charges.
Common Mistakes People Make When Dialling
Some common errors include:
- Forgetting to remove the leading 0 in the UK number
- Using the wrong exit code
- Confusing mobile numbers with landlines
- Dialling without knowing the correct area code
Differences Between UK Landline and Mobile Numbers
UK landlines have specific area codes depending on the city, such as 020 for London or 028 for Northern Ireland. UK mobiles usually start with 07. Always remove the first 0 when dialling internationally. This distinction ensures your call reaches the correct destination.
Step-by-Step Guide to Calling the UK from Ireland
A. Calling a UK Landline Number
To call a UK landline from Ireland:
- Dial Ireland’s exit code: 00
- Enter the UK country code: 44
- Remove the first 0 from the area code
- Dial the remaining landline number
Example: Calling London landline 020 7946 0123
- Dial: 00 44 20 7946 0123
B. Calling a UK Mobile Number
To call a UK mobile:
- Dial 00 for Ireland’s exit code
- Enter 44 for the UK country code
- Remove the leading 0 from the mobile number
- Dial the remaining 10-digit number
Example: UK mobile 07123 456789
- Dial: 00 44 7123 456789
Quick Examples of Correct Number Formats
- London landline: 00 44 20 7946 0123
- Manchester landline: 00 44 161 234 5678
- Mobile: 00 44 7700 900123
Tip: On mobile phones, you can replace 00 with +. For example, +44 7700 900123.
How Much Does Calling the UK from Ireland Cost?
1. Standard Landline Rates
Landline rates vary depending on your provider and the time of day. On average, calls to UK landlines are cheaper than mobile numbers.
2. Mobile Rates
Calling UK mobiles from Ireland is usually more expensive than calling landlines. International mobile rates are higher due to network charges.
3. VoIP Call Costs and Comparison
VoIP services allow you to make international calls over the internet at a lower cost than traditional phone lines. Services like Skype, Zoom, or business cloud telephony can reduce per-minute charges significantly.
Cost Comparison: Landline vs Mobile vs VoIP
Type of Call |
Average Rate (per min) |
Notes |
| Landline | €0.05–€0.12 | Cheapest option via standard phone lines |
| Mobile | €0.20–€0.35 | Higher rates due to mobile networks |
| VoIP | €0.01–€0.05 | Requires internet; lowest cost, high-quality |
Tips for Reducing Costs
- Use VoIP services for regular international calls
- Call during off-peak hours
- Use apps like WhatsApp, Skype, or Messenger for free calling to friends and family.
- Consider a business cloud phone system for predictable outgoing call rates
Best Times and Time Zone Considerations
Ireland is usually 1 hour behind the UK. Being aware of time differences ensures your calls are convenient for the recipient.
What is the Optimal Time to Call?
- Business calls: 9 AM – 5 PM UK time
- Personal calls: Early evening in the UK to match convenient hours
Scheduling your calls reduces missed calls and enhances professional communication.
Alternative Ways to Call UK Numbers from Ireland
1. VoIP Services and Cloud Telephony
VoIP (Voice over Internet Protocol) uses the internet to make calls. It’s cost-effective, reliable, and supports both incoming and outgoing international calls. Businesses often adopt cloud telephony for easy management of multiple UK contacts.
2. Prepaid Calling Cards
Prepaid cards allow fixed-cost calls to UK numbers, helping control expenses without monthly contracts.
3. Internet-Based Options and Apps (WhatsApp, Skype, Messenger)
For occasional calls, apps like WhatsApp, Skype, and Messenger allow free voice and video calls over the internet.
Regional Codes and Variations Across the UK
UK Area Codes for Landlines
- London: 020
- Manchester: 0161
- Belfast: 028
- Birmingham: 0121
Mobile Number Prefixes
- UK mobiles typically start with 07
- When dialling internationally, remove the leading 0
How Codes Differ for Landlines vs Mobiles
Landlines have geographic codes based on the city; mobile numbers have national prefixes. Correct differentiation is crucial to reach the right recipient.
Tips for Smooth International Calls
Ensuring Network Compatibility
Check if your provider supports international calls and VoIP options. Some networks restrict certain numbers.
Preparing Your Device or Service
Ensure your phone is configured for international dialling. Update apps for internet-based calls.
Avoiding Hidden Charges
Always confirm rates with your provider. Avoid premium numbers unless necessary.
How to Troubleshoot Common Issues?
Call Not Connecting
- Verify exit code, country code, and area code.
Wrong Number or Busy Tone
- Check the number format and try again.
Poor Call Quality
- Switch to VoIP if traditional lines are unstable.
- Ensure a strong internet connection.
Solutions and Workarounds
- Use alternative apps for urgent calls
- Contact your service provider for line issues
What are Different Business Use Cases?
Case 1: Calling a UK Number from Ireland
Example: An Irish company calls a London client for project updates:
- Dial: 00 44 20 7946 0123
- Ensures timely communication and maintains professionalism
Case 2: Calling an Irish Number from the UK
Example: A UK supplier contacts a Dublin-based office:
- Dial: 00 353 1 234 5678
- Useful for cross-border businesses managing operations
Tip: Business cloud phone systems handle incoming and outgoing international calls, providing cost-effective, high-quality connections.
SystemNet: Best Business Phone System in Ireland
For businesses looking to streamline inbound and outbound calling, SystemNet Communications Ltd. offers the best cloud-based VoIP phone system for national and international calling, ensuring seamless communication across teams and clients.
- Easy international calling
- Cost-effective rates
- Integration with mobile and office phones
- Professional call management for both UK and Ireland contacts
Key Takeaways
- Always use Ireland’s exit code 00 and the UK country code 44
- Remove the leading 0 from all UK numbers
- Use VoIP or internet-based solutions to reduce costs
- Consider time zones before scheduling calls
- Understand landline and mobile number differences
- Troubleshoot common issues to ensure smooth communication
FAQs
1. Can I use + instead of 00 when dialling?
Yes, + is an alternative to 00 on mobile phones.
2. What is the UK country code?
The UK country code is 44.
3. Are there additional charges for calling the UK?
Rates vary by provider; VoIP is generally cheaper.
4. Can I call UK numbers from mobile and landline alike?
Yes, but ensure the correct format and remove the leading 0.
5. Can I use VoIP or apps for international calls to friends and family?
Yes, apps like Skype or WhatsApp are reliable for personal calls.