The short answer
Broadband is the connection that brings the internet into your home: a fibre cable, a copper phone line, Virgin Media's cable network or, for 4G and 5G home broadband, a mobile signal. Wi-Fi is the short-range radio link your router creates inside your home so phones, laptops and TVs can use that connection without a cable.
The two get used interchangeably because Wi-Fi is how most of us experience broadband. But they are separate links in one chain, limited by different things. Your provider sells the broadband part, and the big providers' speed guarantees stop at the hub. The Wi-Fi part is your home's own network, and it is one of the places the speed you pay for can be lost.
The chain from the network to your device
Not every home has every box, and on many connections several sit inside one hub, but the jobs are the same.
Link | What it does | Whose it is |
|---|---|---|
The network | Carries traffic between the internet and your area; capacity is shared with other homes | Network operator (Openreach, Virgin Media or an independent network) and your provider |
The line | Full fibre, copper phone line, Virgin Media coaxial cable, or a mobile signal | Network operator |
ONT or modem | Turns the signal on the line into a connection a router can use | On full fibre, the ONT where the fibre ends (on Openreach, a separate box on the wall that belongs to Openreach); on Virgin Media cable, the modem is built into the Hub |
Router | Creates your home network and shares the connection over Ethernet or Wi-Fi | Supplied by your provider, or your own where the provider allows it |
Wi-Fi or Ethernet | The last few metres to each device, by radio or cable | Yours |
Your device | Phone, laptop, TV or console, with its own Wi-Fi chip and network port | Yours |
How broadband reaches your home
Which boxes you have depends on your connection. Openreach, whose network is used by over 650 providers, describes three ways it connects homes. Virgin Media runs its own cable network, independent full fibre networks (altnets) build their own lines, and 4G and 5G home broadband skips the line altogether.
Full fibre (FTTP)
Fibre to the Premises, also called FTTH or full fibre, runs fibre from the exchange into your home; Openreach quotes download speeds up to 1,600Mbps (checked October 2026). On Openreach full fibre the fibre ends at a small white box on your wall called an ONT, and the router your provider sends plugs into that. Our guide to the full fibre ONT and its lights covers it in detail, and you can compare packages on our fibre broadband deals page.
Part fibre (FTTC) and copper (ADSL)
Fibre to the Cabinet, also sold as superfast broadband or VDSL, runs fibre to the green street cabinet, then uses your copper phone line for the last stretch. Openreach quotes up to 76Mbps download and 15Mbps upload.
Copper broadband (ADSL) uses the phone line all the way to the exchange; Openreach quotes up to 21Mbps download and 1Mbps upload. On both, the router plugs into a phone socket, and Openreach says homes closer to the cabinet or exchange tend to get faster speeds.
Virgin Media cable
On Virgin Media's cable network, the coaxial cable coming into your home plugs straight into the Virgin Media Hub. Its Hub 5 connects to the cable network using a standard called DOCSIS 3.1; the Hub 5x connects to Virgin Media's full fibre using XGS-PON. See our Virgin Media broadband deals page.
4G and 5G home broadband
Here a mobile signal replaces the line. Three says its home broadband needs no landline or engineer: you plug the 4G or 5G hub into power and it connects to Three's mobile network, then creates Wi-Fi like any router. Three says speed is not guaranteed and can be affected by hub position, line of sight to the nearest mast, the local landscape, how many people nearby are using the network and the thickness of walls and windows. See our Three broadband deals page.
The modem, and the ONT that does its job on full fibre
A modem is the part of the chain that understands the line: it translates the signal on a phone line, coaxial cable or fibre into an ordinary data connection a router can use. Virgin Media puts it plainly: a Hub is a modem and a router in one.
On Openreach full fibre that job is done by the ONT (Optical Network Terminal), the small white box where the fibre enters your home. According to Openreach:
- It converts the fibre signal into a connection your router can use. It is not a router or a traditional modem, but it does the job a traditional modem used to do.
- On its own it gives no Wi-Fi or usable internet connection. Your router connects to it by Ethernet cable, from an Ethernet port on the ONT (sometimes labelled LAN or Data) into the router's WAN or internet port.
- It has its own power supply. Unplug it and your broadband stops, wired and Wi-Fi alike.
- Solid PON and LAN lights mean it is connected. No lights, a flashing PON light or a red LOS light may mean a connection problem.
Openreach says the ONT, its power supply and the fibre cabling are part of the property's infrastructure, belong to Openreach and should stay in place, even when you move. If you switch provider, the new one uses the same ONT and fibre connection, so there is nothing to unplug or return.
What the router does
The router turns one internet connection into a home network. It shares the connection between every device, offers Ethernet ports for wired connections, and broadcasts the Wi-Fi network you see by name on your devices (that name is the network's SSID). On full fibre it plugs into the ONT; on phone-line broadband it connects to the phone socket.
The ports on the back
A separate router has one outward-facing port, usually labelled WAN or internet, for the ONT or modem, and LAN ports for your own devices. Port speed matters. ISPreview, the UK broadband news site, said in an article last updated in April 2025 that most routers ship with 1Gbps Ethernet ports, and that after overheads the top usable speed of a single 1Gbps port is around 987Mbps (about 930Mbps on some older set-ups). So on a package faster than 1Gbps, one device on a 1Gbps port can't get the full speed. That is why faster hubs add a faster port: Virgin Media's Hub 5 has one 2.5Gbps port and the Hub 5x one 10Gbps port, each alongside three 1Gbps ports. If you are buying a multi-gigabit package, check the hub's port list as well as its Wi-Fi.
Cable counts too: ISPreview says cable older than Cat5 can't handle even 100Mbps, and recommends at least Cat5e on a 1Gbps line. See our guide to wiring your home with Ethernet.
The Wi-Fi radios: 2.4GHz, 5GHz and 6GHz
Routers broadcast on more than one band. The Wi-Fi Alliance, the industry body behind Wi-Fi, says most Wi-Fi 5 products are dual-band: the less crowded 5GHz band for demanding tasks, 2.4GHz for basics such as browsing and smart gadgets. YouFibre, a full fibre provider, sums them up: 2.4GHz goes further and through walls, 5GHz is fast over a smaller area, and 6GHz, on newer routers, is an extra lane that eases congestion. Wi-Fi generations (Wi-Fi 5 arrived in 2014, Wi-Fi 6 in 2018 and Wi-Fi 7 in 2024) matter too; our guide to Wi-Fi 6, 6E and 7 explains what they change.
What a provider hub combines
Openreach says most broadband providers supply a compatible router when you sign up, and BT, EE, Sky and Virgin Media all call theirs a hub. A hub can combine several jobs: the modem (Virgin Media describes its Hub as a modem and a router in one), the router and its Ethernet ports, the Wi-Fi radios and a phone port; Virgin Media lists a phone line and a guest network on each current Hub. On Openreach full fibre the ONT does the modem's job, so the hub plugged into it works mainly as a router and Wi-Fi box; on 4G and 5G the mobile connection is built into the hub.
Modem mode and using your own router
Because a hub bundles jobs together, you can sometimes switch off its router and use your own. Virgin Media's modem mode turns the Hub into a cable modem for your own Wi-Fi kit. It works on the Hub 3, 4 and 5 but is not currently available on the Hub 5x, and some features switch off, including Intelligent WiFi and compatibility with its Wi-Fi Pods; its internet phone service still works.
Full fibre providers set their own rules, so ask before you buy kit. Two examples (checked October 2026): Truespeed says you can use your own router but it only supports the equipment it provides, and you call its customer team to set it up. 4th Utility says you can, and supplies a free bridge device that the fibre plugs into, with your router connected to the bridge's Ethernet port and login details from your online account. Our guide to using your own router covers what to check first.
Who owns the hub
BT says its hubs and Wi-Fi extenders remain its property and must be returned within 60 days of leaving; Sky says its equipment is returned when the subscription ends. Read your provider's returns rules before switching so you aren't charged for unreturned kit; the Openreach ONT is not part of that and stays on the wall.
Where speed can be lost along the chain
Openreach lists the main factors as the broadband technology, distance to the exchange or cabinet, wiring and equipment in your home, and Wi-Fi signal strength. Ofcom adds time of day, how many people at home are online at once, devices not set up correctly, line damage and traffic management.
On the network
Capacity is shared between many homes, and ISPreview says that is most likely to show at peak evening times; Openreach calls these evening dips network congestion. See our guide to why broadband slows down in the evening.
On the line and your home's wiring
On part fibre and copper, the longer the copper run to the cabinet or exchange, the slower the line tends to be, and a damaged line slows things further. If you still have a traditional phone service on the line, Ofcom's tips (last updated September 2024) are to plug the router into the main phone socket, use a microfilter (a small adapter that separates phone and broadband signals) and avoid phone extension leads, which can cause interference.
That advice is changing as the old analogue phone network is retired: GOV.UK says most customers are expected to have moved to digital phone services by the end of January 2027, and that for many the change is as simple as plugging the phone into the broadband router rather than the wall socket. If your line has already moved over, follow your provider's own setup guide for how the router connects.
At the router
Where the router sits makes a real difference. Put it in the open, on a table or shelf rather than the floor, and away from things Ofcom says have been known to affect routers: halogen lamps, dimmer switches, speakers, fairy lights, TVs and monitors, power cords, cordless phones and baby monitors. Virgin Media also asks for its Hub to stand upright, away from radiators and at least a metre from other electronics.
Leave it switched on. Which? explains that your provider can't tell a router being switched off from a line failing, which could lead to slower speeds. And if your router is old, Ofcom suggests considering an upgrade.
Over Wi-Fi
Wi-Fi has to travel distances and pass through doors, walls and ceilings, which can weaken it, and its speed is shared between every connected device (Virgin Media). ISPreview says the best Wi-Fi performance tends to be within a few feet of the router, in the same room. Keep a password on your network too: Ofcom warns that an unsecured router could let others use and slow your broadband.
Providers' own figures show the gap. Community Fibre says its headline speeds are for a single wired connection to its router, and publishes same-room Wi-Fi figures of 500-750Mbps on its 1Gbps package, 700-950Mbps on 2.5Gbps and 800-1,050Mbps on 5Gbps (checked October 2026). Those are one provider's figures for its own kit, not a rule for every home.
On the device and beyond
Each device has its own Wi-Fi chip and antenna, and ISPreview notes many smartphones' may be less capable than a high-end laptop's. If only one device struggles, Virgin Media says the device may be the problem. Background updates add load, and ISPreview says a VPN, which routes traffic through its own servers, can slow speeds significantly. Many online services also cap the speed each connection gets.
What speed guarantees cover, and where they stop
Provider promises cover the broadband link, not your Wi-Fi.
- Ofcom's speeds code. Signatories (BT, EE, NOW Broadband, Plusnet, Sky, TalkTalk, Utility Warehouse, Virgin Media and Zen) should give you an estimated speed at busy times (8pm to 10pm) and always a minimum guaranteed speed, based for superfast products on what the line into your home can do. If a problem on the provider's network isn't fixed within 30 days, you can leave without an exit fee. Since 21 December 2022 that exit right also covers any product linked to the broadband financially, contractually or technically, such as bundled TV or a landline. It doesn't apply to rolling monthly contracts, which you can leave by giving notice (usually a month) anyway.
- Your minimum speed. Citizens Advice says that for contracts started on or after 1 March 2019 you can ask your provider for your Minimum Guaranteed Access Line Speed (MGALS).
- Guarantees stop at the hub. EE's Speed Guarantee is the minimum speed to the hub rather than to devices over Wi-Fi; BT's Stay Fast Guarantee covers speed to the BT hub; Sky's is based on download speed to the Sky Hub. Trooli guarantees wired speeds to its router within 10% of the service ordered and says Wi-Fi speeds are not guaranteed.
So with those providers, slow Wi-Fi on a healthy line is yours to fix, while a line below its minimum is your provider's to fix. See our guides to the minimum speed guarantee and provider Wi-Fi guarantees (details checked October 2026).
How to find which link is slow
Work outwards from the router.
- Check the lights. On Openreach full fibre, solid PON and LAN lights on the ONT are good; a flashing PON or red LOS light points to a connection problem. Then check the hub; our guide to broadband hub lights explains common patterns.
- Test wired at the router. Ofcom advises a computer connected by Ethernet for the most accurate result, because Wi-Fi can slow the signal. Pause other downloads, then use our broadband speed test and note download, upload and latency (ping, the delay in milliseconds). Ofcom suggests running a few tests over several days at different times. On a very fast line, ISPreview warns that web-based tests can be unreliable at gigabit speeds, so test wired and repeat the test before drawing conclusions.
- Compare with your minimum guaranteed speed. If wired results stay well below it at different times of day, report it to your provider, who can check the line, the hub and your wiring (Openreach).
- Test on Wi-Fi next to the router, then where you usually sit. A big drop between the two is a coverage problem; a drop even beside the router points to the router or device.
- Try a second device. If only one is slow, suspect that device, its updates or a VPN.
- Restart sensibly. For the ONT, Openreach suggests switching it off at the power for 30 seconds.
For line faults, contact your provider, not Openreach: Openreach maintains the network, but your provider manages your connection and can check the line, equipment and wiring. Our guide to reporting a broadband fault walks through it.
Fixing the Wi-Fi, or changing the broadband
- The line is fine, Wi-Fi isn't. Move the router into the open, cable the devices that matter most and secure the network; our guide to improving your Wi-Fi signal has more. Which? explains that a mesh system's main unit plugs into the router (or a separate modem), while extenders and powerline adapters smooth over small gaps but won't cover a large area. Our guide to mesh Wi-Fi vs extenders compares them.
- The line matches the package but isn't enough. The limit is the package or technology. Enter your postcode in the comparison on our broadband deals page to see which packages and network types our partner's comparison lists for your address, or use our broadband-only deals page if you don't need a landline or TV.
- The line is below its minimum. Raise it with your provider and keep your wired test results.
When comparing, look beyond the headline figure: the minimum guaranteed speed, the busy-time estimate, the Wi-Fi kit included and whether the hub's ports can carry the speed you are buying. We compare deals through our partner's comparison; we don't switch you ourselves, and the choice is yours.
Broadband vs Wi-Fi FAQs
Are broadband and Wi-Fi the same thing?
No. Broadband is the connection into your home, by fibre, copper phone line, Virgin Media cable or a 4G or 5G signal. Wi-Fi is the short-range radio network your router creates so devices can use that connection without cables. Ethernet cables are the other way to share it.
Do I need a modem if I have full fibre?
Not a separate one. On Openreach full fibre, the ONT on your wall does the job a traditional modem used to do. You still need a router, usually from your provider, connected to the ONT by Ethernet cable, because the ONT gives no Wi-Fi on its own.
Why is my Wi-Fi slower than the speed I pay for?
Package speeds describe the connection, not each device. Virgin Media says the package speed is the highest you should get on a wired connection, and Community Fibre says its headline speeds are for a single wired connection. Wi-Fi weakens with distance and through walls, is shared between all connected devices and is limited by each device's own Wi-Fi hardware.
How can I tell whether the problem is my broadband or my Wi-Fi?
Plug a computer into the router with an Ethernet cable and run a speed test, as Ofcom advises, a few times at different times of day. If the wired speed is close to what you were promised but Wi-Fi is slow, the problem is most likely in your home. If wired is also low, contact your provider.
Can I use my own router instead of my provider's hub?
It depends on the provider. Virgin Media's modem mode lets you connect your own Wi-Fi kit to the Hub 3, 4 or 5, though not currently the Hub 5x, and some Hub features switch off. Some full fibre providers allow it too, such as Truespeed (which only supports its own kit) and 4th Utility (which supplies a bridge device). Ask your provider first.
