Switching to Three’s 5G Broadband offers a modern, flexible alternative to traditional wired broadband connections. With no need for phone sockets, engineer visits, or long installation waits, Three’s plug-and-play 5G router delivers fast wireless internet straight to your home. While it provides impressive speeds and simplicity, one feature many customers notice, and one we often get asked about is how to keep your landline when switching to Three 5G broadband? Three’s 5G internet doesn’t come with a traditional landline but there is a way.

If you’re used to having a landline number—whether for personal use, family contact, or business visibility—you may wonder how to maintain that connection without a traditional phone line. The answer is VoIP: Voice over Internet Protocol. With Plexatalk, you can not only keep your existing number but also enjoy a more flexible and modern way to handle calls at home or on the go.

Three 5G Router - Keep Your Landline When Switching to Three 5G Broadband

Why You Might Still Want a Landline

Despite the rise of mobile phones, landlines continue to play an important role for many UK households and small businesses. Here are a few reasons why you might not want to give yours up:

  • You’ve had the same number for years and people still use it to reach you.
  • Elderly relatives, medical services, or monitoring systems rely on it.
  • You run a small business and your number appears on flyers, signage, or business cards.
  • You want a fixed phone option that doesn’t rely on mobile coverage.

While Three’s 5G broadband offers great data performance, it doesn’t include voice service or a landline replacement. That’s where Plexatalk’s VoIP service comes in.

What Is VoIP and How Does It Work with Three 5G?

VoIP allows you to make and receive calls using your internet connection instead of a traditional copper telephone line. It works seamlessly over Three’s 5G network and gives you the ability to:

  • Keep your existing landline number.
  • Use your current telephone handsets with a VoIP adapter (ATA).
  • Upgrade to a dedicated VoIP desk phone that plugs directly into your router.
  • Use a smartphone, tablet, or laptop to make and receive calls through our Plexatalk VoIP app.

Your phone number becomes flexible—you can use it anywhere, on any internet connection.

Tested Across Devices and Connection Types

We’ve rigorously tested the Plexatalk platform with Three’s most commonly used home broadband routers, including older 5G and 4G models. Our systems have been proven to work with:

  • Three ZTE MC801A 5G router
  • Huawei 5G CPE Pro 2
  • Other budget 5G routers and MiFi devices

Even older DECT cordless handsets work fine using a standard ATA (Analogue Telephone Adapter). We recommend a minimum internet speed of 25 Mbps download and 5 Mbps upload for the best experience. However, the most critical factor isn’t just speed—it’s connection stability. If your Three 5G router has a strong and consistent signal, your calls will sound as clear as any fixed-line phone.

Switching Doesn’t Mean Starting Over

One of the biggest advantages of using VoIP is that your phone service becomes provider-independent. If you ever switch from Three to another broadband provider—like full-fibre, Starlink satellite, or even another 5G provider—your VoIP setup continues to work.

All you need to do is:

  • Reconnect your VoIP adapter or desk phone to the new router
  • Or reconnect your VoIP app to Wi-Fi or mobile data

Your number stays active, and you won’t need to notify contacts or change how people reach you.

How to Port Your Landline to Plexatalk

Transferring your landline number to Plexatalk is quick and straightforward:

  1. Contact our support team with your current phone number and provider.
  2. We’ll send you a digital Customer Letter of Authority (CLoA) to approve the number transfer.
  3. We initiate the porting process with your existing provider.
  4. Once your number has been successfully transferred, we activate it on the Plexatalk network.
  5. You connect using your preferred setup—adapter, VoIP handset, or app—and start making and receiving calls as normal.

We also provide number porting support if you’re mid-contract or need to schedule the transfer for after your Three 5G broadband goes live.

VoIP Options for Home and Business Users

Whether you’re at home or running a small business, we have a VoIP setup that suits you:

Home Users:

  • Use your existing landline phone with an ATA adapter
  • Get voicemail features and caller ID
  • Forward calls to your mobile or use the Plexatalk app when you’re out

Small Businesses:

  • Multi-handset VoIP phone systems
  • Set up a virtual receptionist, call menu, or working hours
  • Use multiple numbers and extensions
  • Voicemail-to-email for efficient management

All services are available without line rental fees, and our platform scales with your needs.

A Real-World Example

Ben, a customer in Leeds, switched to Three 5G broadband after experiencing long delays in getting full-fibre installed. His main concern was losing the landline number tied to his family and work contacts. We helped Ben:

  • Transfer his number from Sky
  • Connect his cordless phone through our ATA adapter
  • Install the Plexatalk app on his iPhone so he could answer calls while away from home

Now Ben has ultrafast wireless broadband and his trusted phone number—no disruption, no missed calls.

Frequently Asked Questions – Keep Your Landline When Switching to Three 5G Broadband

Does Three 5G broadband come with a phone line?

No. Three’s home broadband plans are data-only. You’ll need a VoIP solution to replace your landline.

Can I keep my old phone number?

Yes. You can port your number to Plexatalk before cancelling your existing service.

Will my current landline phone still work?

Yes. With a VoIP adapter, almost any home phone can be used just like before.

Can I use my landline number on my smartphone?

Yes. Our Plexatalk Phone System lets you make and receive calls from your landline number on your mobile with third party apps.

Is VoIP call quality reliable over 5G?

Yes, provided you have a stable 5G connection. Speed matters less than stability for VoIP.

Can I still use Plexatalk if I change broadband providers?

Absolutely. Our system works over any internet connection in the UK.

How long does it take to port a number?

Usually 7–10 working days, but we’ll guide you through the process and schedule it to minimise downtime.


Get Started with Plexatalk

If you’re moving to Three 5G and want to keep your landline number, we make the switch easy.

  • Keep your number without paying for line rental
  • Use your existing phones or choose from modern VoIP handsets
  • Make and receive calls from home or while travelling
  • Rely on a tested, future-ready voice service that works with any broadband

Contact our team today to get started:

Phone: 0330 057 6699
Email: support@plexatalk.co.uk

Browse our Residential VoIP Packages or Business VoIP Solutions to find the right fit.