Keep Your Landline Number With VoIP
Yes, in most cases, UK businesses can keep their existing landline phone number when switching to VoIP. If you are asking, Can I Keep My Landline Phone Number with VoIP, the answer is usually yes. This is done through number porting. It means moving your number from your old phone provider to your new VoIP service. Customers can still call the same number they already know.
Let's be honest. Nobody wants to update every website page, invoice, email signature, customer record, van sticker and that one slightly wonky sign above reception. Changing your business number can feel like admin with a grudge. So keeping it matters. If you want a managed route into cloud calling, Cleartwo can help you plan the move without turning it into a telecoms treasure hunt.
The good news is simple. Number porting is a normal part of moving to VoIP. Cleartwo is a fully managed UK VoIP specialist. The team handles the setup, porting checks, Teams voice integration and support. You also get business grade features at SME pricing, with a 99.99% uptime SLA. That means a strong service availability promise.
What Number Porting Means
Number porting is the process of moving your existing business phone number from one provider to another. In this case, it means moving your landline number from a traditional PSTN service or ISDN line to hosted VoIP or a cloud PBX system. PSTN is the old analogue phone network. ISDN is an older digital phone line service. A cloud PBX is an online phone system that manages calls without the old phone box in the office.
How Porting Works For UK Businesses
Here's the thing. You do not pick up the number and carry it across like a suitcase. Your new VoIP provider sends a port request to your current provider. This uses your account details and your written permission.
That permission is usually given through a Letter of Authority. It confirms that your business allows the new provider to take control of the number. No stress. It is less dramatic than it sounds.
Once the request is accepted, a port date is agreed. On that date, calls to your old landline number are sent to your new VoIP phone system instead. Your customers should not need to do anything.
Why You Do Not Need To Change Your Public Number
Your business number is part of your brand. It sits in customer phones, supplier records, online directories and printed material. Losing it can mean missed calls, confused customers and a lot of awkward admin.
Porting lets you update your business telephony UK setup while keeping the number people already trust. You can move to hosted VoIP, add call recording, connect your CRM, use Microsoft Teams phone features and still keep your familiar 01, 02 or 03 number.
Which UK Numbers Can Be Ported To VoIP?
Most standard UK business numbers can be ported to VoIP. Some number types need extra checks. The key is to audit every number before the request starts. Telecoms admin loves finding one tiny mismatch at the worst possible moment.
Geographic Numbers
Geographic numbers are the familiar 01 and 02 numbers linked to UK areas. This could be a Manchester, London, Stockport or Birmingham number. These are often ported into cloud phone systems.
Many businesses keep these numbers because customers recognise them as local and trusted. With VoIP, you can keep that local identity. You can also answer calls from the office, home, a mobile app or a Microsoft Teams phone setup.
Non Geographic Numbers
Non geographic numbers include 03, 08 and some service numbers. Many can be moved to VoIP. The process can depend on the current provider, number range and contract setup.
03 number porting is common for organisations that want a national presence. Some 08 numbers may need more checks due to routing rules, service setup or attached features. Between you and me, this is where a managed provider earns its tea and biscuits.
Numbers That Need Extra Checks
Some numbers are not impossible to port, but they may need special handling. This includes large DDI ranges. DDI means direct dial in, which is a group of direct numbers for staff or departments. It also includes numbers linked to old PBX systems, SIP trunking services, fax lines, lift phones, payment terminals, alarms and broadband services. SIP trunking is a way of carrying business calls over the internet, often for larger or more advanced phone setups.
If your landline does more than make calls, do not assume it is safe to switch it off. Have you checked what else is connected to that line? That old line may be quietly supporting something important. No judgment. These things hide in cupboards like office gremlins.
How Long Does Number Porting Take?
UK business number porting usually takes around 10 working days to several weeks. It depends on the number type, provider response times and how complex the setup is. Simple single number ports are often quicker. Multi site or multi number moves take longer.
Typical Porting Timelines
A straightforward business landline to VoIP port can often be completed in about two to three weeks once the details are correct. Larger moves with many DDIs, several sites or older phone systems may need more planning.
The most important part is not just speed. It is accuracy. A rushed port with wrong details can bounce back and cause delays. A careful port with clean data is far less exciting. In telecoms, that is exactly what we want.
What Affects The Schedule
Porting can be delayed if the business name, address, postcode or account number does not match the current provider's records. It can also be affected by contract limits, unclear number ownership or missing bill details.
Another common issue is cancelling the old service too early. Please do not do that. Your old line should stay active until the number transfer is complete. If not, the port can become much harder.
What Happens On Port Day
On port day, call routing changes from your old phone provider to your new VoIP system. Calls start arriving through your cloud PBX, hosted VoIP handsets, softphones or Teams voice integration.
There may be a short changeover window while routing updates. A good provider will test inbound and outbound calling, caller ID, hunt groups, call queues and voicemail. Cleartwo also checks call recording and routing rules. That means your team is not left staring at silent phones.
What UK Businesses Need Before Starting A Port
Before starting a landline number port to VoIP, gather your latest phone bill, account details, full number list and details of any services connected to the line. This saves time and lowers the chance of the port being rejected.
Your Porting Checklist
- Latest phone bill
- Account holder name
- Registered business address
- Full number list
- DDI range details
- Active line status
- Linked service checks
You will also need to sign a Letter of Authority. This tells the current provider that the transfer is genuine. It is not glamorous paperwork, but it is important paperwork.
If you are reviewing the wider move, Cleartwo's VoIP phone system service explains how cloud calling, SIP trunking, hosted VoIP and Microsoft Teams phone features can work together for UK businesses.
Potential Issues That Can Delay Number Porting
The most common porting delays come from mismatched details, cancelled lines, unclear ownership, hidden services and complex number ranges. These issues are avoidable with a proper audit before the request is sent.
Mismatched Account Details
If your bill says one company name but your port request says another, the port may be rejected. The same applies to old trading names, previous office addresses and missing postcodes.
This is common when a business has moved premises, changed legal entity or inherited an old phone contract. Do not worry. We have all been there. Business admin has a habit of turning into an archaeology project.
Cancelling The Old Line Too Early
This is the big one. Keep the existing line active until the port has completed. If the number is disconnected too soon, the provider may not be able to release it in the normal way.
If you are moving because of the PSTN switch off, plan early. The UK analogue phone network is due to be retired by January 2027. Waiting until the last minute could put pressure on porting queues and setup dates.
Services Attached To The Line
Some landlines support more than voice calls. They may connect alarms, card terminals, fax machines, lift phones, door entry systems or broadband. These must be checked before the number moves.
Ask yourself this before starting the switch. If this line disappeared tomorrow, what would stop working? Modern replacements are available, but they need planning. A VoIP move can also be a good moment to review backup options, security and the systems your team relies on every day.
How Cleartwo Handles Number Porting Without Disruption
Cleartwo manages number porting from discovery to go live. This helps UK businesses switch to VoIP without needless disruption. The process is structured, practical and built to keep calls flowing.
Discovery And Number Audit
First, Cleartwo reviews your current phone setup. This includes your main number, DDIs, current provider, contracts, call flows, users, handsets, broadband and any services that depend on the line.
This step is not just admin. It helps build the right cloud PBX design before anything moves. For growing teams, it can include call queues, call recording, voicemail to email, CRM connection and Microsoft Teams phone routing.
Port Submission And Tracking
Once the details are confirmed, Cleartwo prepares the port request and tracks it through the process. If the old provider raises a query, Cleartwo deals with it and keeps you updated.
You are not left decoding telecoms language on your own. That alone is worth celebrating with a biscuit.
Testing And Go Live Support
Before port day, Cleartwo sets up your VoIP users, call groups, devices and routing. After the port, the team tests calls in both directions. They also check caller ID and confirm that key features work.
If your business needs connected systems, Cleartwo can help your phone setup work with CRM tools, reporting and wider digital systems. You can also read more in this guide to keeping your business phone number when switching to VoIP.
Why CallSwitch One Is Worth Considering
For many UK businesses, CallSwitch One is a practical choice. It brings business calling, cloud PBX features and flexible user management into one modern platform. Cleartwo is a CallSwitch One reseller. This means customers can get the platform with managed setup, porting support and clear advice from a UK based team.
If you would like to see what the platform includes before making a decision, you can learn more about CallSwitch One. The real benefit of buying through Cleartwo is that you are not just handed a login and wished good luck. You get setup, porting help, UK based support and practical guidance from people who understand business telephony UK.
That matters because VoIP is not just about cheaper calls. It is about how your team works. Sales teams may need CRM screen pops. Support teams may need call recording and analytics. Hybrid teams may need softphones and Teams voice. The right setup should match the way your people work in real life.
What Happens To Your Number During The Transition?
During the transition, your existing landline number should remain live with the old provider until the port completes. Your new VoIP system can be built and tested in advance. This makes the final switch much smoother.
In many cases, temporary numbers or call forwarding can be used while the new setup is prepared. This lets your team test handsets, apps, call queues and voicemail before the real number moves.
Once porting completes, inbound calls route to the new VoIP system. Outbound calls can show your usual business number, so customers see the same caller ID. Nice and tidy. That is how business phone changes should feel.
The key is to avoid a cliff edge. Cleartwo plans the changeover, checks fallback options and stays involved after go live. If something needs changing, such as opening hours, call routing or voicemail messages, it can be adjusted quickly.
Frequently Asked Questions
Can I Keep My Landline Number If I Switch To VoIP?
Yes. Most UK businesses can keep their existing landline number when moving to VoIP through number porting. Your new provider requests the transfer from your current provider. Once the port completes, calls route to your new hosted VoIP or cloud PBX system.
How Long Does It Take To Port A UK Business Number To VoIP?
A simple UK business number port often takes around 10 working days to three weeks. Complex ports can take longer. Timelines depend on the number type, current provider, account accuracy, DDI ranges and whether any services are linked to the line.
Do I Need To Cancel My Old Landline Before Porting?
No. You should not cancel your old landline before the port completes. The line normally needs to stay active so the number can be released correctly. Cancelling too early can delay the transfer or make recovery of the number harder.
Can I Port 01, 02 And 03 Numbers To VoIP?
In most cases, yes. UK 01 and 02 geographic numbers are commonly ported to VoIP. 03 numbers can often be ported too. Some numbers need extra checks, especially if they are part of a larger range or linked to special routing.
Can I Use My Ported Number In Microsoft Teams?
Yes. Once your number is moved to a compatible VoIP platform, it can often be used with Microsoft Teams phone integration. Cleartwo can help set up Teams voice so users can make and receive calls from Teams while keeping the same business number.
