Last updated: Saturday 24 October 2026 (Europe/London).
Next update: when Onestream or the providers below change their prices, and before the April 2027 price rises.
By: Switch Editorial Team, Switch Squid Ltd
As of 24 October 2026, Onestream’s cheapest broadband is a 40Mbps fibre plan at £18.50 a month, and it says full fibre speeds of up to 1,000Mbps are available at some addresses. It is a budget provider that rents other networks’ lines, mainly Openreach, rather than running its own. If you can get full fibre, BT’s Full Fibre 150 costs £23.99 a month through our link, with up to £300 towards leaving fees. Onestream suits people who want a cheap, simple connection and are happy to deal with a smaller company; its record includes a 2019 Ofcom fine, and it took over Cuckoo’s customers in 2026. This SwitchSquid review covers who owns Onestream, which network it uses, what it costs and how it compares. We may earn a commission if you buy through links on this page; it doesn’t change the price you pay.
Sources: Onestream, Companies House, ISPreview, Ofcom and BT broadband deals, checked on 24 October 2026.
BT Full Fibre 150: £23.99 a month through our link, plus up to £300 towards leaving fees
- £23.99 a month on a 24-month contract, then £27.99 from March 2027 and £31.99 from March 2028, when we checked on 24 October 2026
- No code needed; £0 activation; for new BT broadband customers where full fibre is available
- Main limitation: full fibre must reach your address, and the price rises each March
Is Onestream broadband any good?
Onestream is a reasonable choice if price is your main concern and you want a basic, no-frills connection. Its entry plan is cheap, it has no data caps, and it lets you use your own router if you already have a good one, sending the login details before your service goes live. Onestream says it has over 25,000 five-star reviews, and it markets itself on one-to-one customer service.
The trade-offs are real, though. Onestream doesn’t run its own network, so your speed depends on the line at your address, just as it would with any other Openreach provider. It is a much smaller company than BT, Sky or Virgin Media. And in 2019 Ofcom fined it for switching customers’ phone lines without permission, which is worth knowing even though it was several years ago. If you can get full fibre, it is worth comparing Onestream’s price at your postcode with the bigger names before you sign.
What we like
Low entry price: 40Mbps for £18.50 a month on its homepage on 24 October 2026.
Unlimited downloads with no usage caps.
You can bring your own router.
Full fibre at some addresses, with speeds up to 1,000Mbps.
What to watch
Full fibre prices only show after a postcode check.
Prices rise every April during the contract.
A smaller provider, with an Ofcom enforcement case in its history.
Who owns Onestream broadband?
Onestream is run by Onestream Limited, a company registered in England and Wales (number 10389581) with its office in Whiteley, near Fareham in Hampshire. Companies House lists Ridown Capital Limited as the person with significant control since 19 July 2019, holding 75% or more of the shares. Before that date, Onecom Group Limited held the controlling stake.
In May 2026, Onestream agreed to take over the customer base of Cuckoo, another home broadband provider. ISPreview reported that Cuckoo’s contracts, brand and website would move to Onestream, while customers’ connections stay on the wholesale platform run by AllPoints Fibre Networks. Cuckoo stopped taking new customers from 4pm on 11 May 2026, and Choose.co.uk reported that the deal would take Onestream from around 75,000 to around 150,000 customers.
Which network does Onestream use?
Onestream sells broadband over other companies’ networks. Most of its lines run on Openreach, the national network that BT, Sky, TalkTalk and many others also use. ISPreview reported that the Cuckoo deal also gives Onestream access to a wider full fibre range through the AllPoints Fibre wholesale platform, which includes Openreach, CityFibre and AllPoints’ own fibre.
In practice this means your speed with Onestream will be similar to what any other Openreach provider can give you at the same address. Onestream’s homepage estimates 35Mbps download and 9Mbps upload on its 40Mbps plan. If you need faster uploads for work calls or backups, look at full fibre, and check our what broadband speed do I need guide.
Onestream vs BT and Hey!Broadband: prices compared
We compared Onestream’s published entry plan with BT and Hey!Broadband on 24 October 2026. BT’s Full Fibre 150 price is the one shown on BT’s online offer page that our link opens; its other prices are from bt.com’s public deals page. The 24-month totals assume a November 2026 start and include the April rises.
Deal | Speed | Monthly price | Contract | Upfront | Code | 24-month total | Best for |
|---|---|---|---|---|---|---|---|
Onestream 40Mbps fibre | 35Mbps down, 9Mbps up (estimate) | £18.50 | Shown at checkout | Shown at checkout | None shown | Depends on contract length and April rises | Light users on a tight budget |
BT Full Fibre 150 (through our link) | 150Mbps | £23.99, then £27.99 from March 2027 and £31.99 from March 2028 | 24 months | £0 activation | No code needed | About £680, before up to £300 leaving-fee credit | Switchers still in contract elsewhere |
BT Full Fibre 900 | 900Mbps down, 110Mbps up | £33.99, then £37.99 from March 2027 and £41.99 from March 2028 | 24 months | £0 activation | No code needed | About £920 | Busy homes and gamers |
Hey!Broadband Superfast 150 | 150Mbps down and up | £23, then £25 from April 2027 and £27 from April 2028 | 24 months | £0 | No code; £100 credit with One Touch Switch | About £504 after the credit | Homes in its London and South coverage |
How we worked out the totals: five months at the starting price, twelve months at the 2027 price and seven at the 2028 price. Hey!Broadband prices are from its homepage, checked on 24 October 2026.
What the numbers say: Onestream’s £18.50 is the lowest monthly price here, but it buys a 40Mbps connection. For £5.49 a month more, BT’s Full Fibre 150 through our link gives you roughly four times the download speed on the same Openreach network, and up to £300 towards fees if you are leaving another provider early. If Hey!Broadband reaches your street, its symmetrical 150Mbps plan is cheaper still over two years.
Choose BT Full Fibre 150: about £5.49 a month more than Onestream’s 40Mbps plan
- £23.99 against £18.50 for Onestream 40Mbps, for roughly three to four times the download speed
- Up to £300 towards leaving fees from your old provider, paid as bill credit
- No code needed; new customers only, subject to a postcode check
How much does Onestream go up each April?
Onestream’s contracts include a price rise every April. Since 17 January 2025, Ofcom has required broadband providers to show mid-contract rises in pounds and pence before you sign, so the exact amount should be on your order summary. Choose.co.uk reported a fixed rise of £2.75 each April on Onestream plans; check the figure on your own quote, because it is the one that applies to you.
Our broadband contract ending guide explains what happens when your minimum term finishes.
What happened with Ofcom and Onestream?
In December 2019, Ofcom fined Onestream £35,000 for “slamming”, which means switching people’s phone services without their permission. Ofcom found that between April 2018 and January 2019 Onestream slammed at least 118 customers, many of them elderly or vulnerable, and that it had made repeated attempts to switch people who had already cancelled. Onestream admitted the breach and settled, and Ofcom said it had stopped outbound phone sales.
That case is now almost seven years old and relates to landline sales, not today’s broadband service. We mention it because it is part of the public record, and because it is a reminder to only ever switch provider when you have asked to.
How to switch to Onestream, or away from it
Check your postcode on the provider’s site to see which speeds reach your address.
Find your current contract end date so you know whether exit fees apply.
Order with the new provider and use One Touch Switch. Your new provider arranges the switch and cancels the old service, so you don’t need to call your current provider first.
Keep your old router until the new line is live, then return it if asked.
Our One Touch Switch guide covers the details. If you are weighing up other smaller providers, our Hey!Broadband review, Hyperoptic review and YouFibre review cover three full fibre alternatives.
Who it suits
Good fit for Onestream: you want the lowest monthly price for basic fibre and don’t need fast uploads.
Good fit for BT Full Fibre 150 through our link: full fibre reaches your home and you want more speed for a few pounds more, or help with leaving fees.
Good fit for Hey!Broadband: you live in its coverage area and want symmetrical full fibre.
Consider a big provider: if you would rather deal with a larger company with a long track record.
Want help choosing? Squid AI, SwitchSquid’s AI assistant, can help you compare broadband deals at your postcode.
Important conditions
Onestream’s full fibre prices and contract lengths depend on your address.
BT’s £23.99 Full Fibre 150 price is on BT’s online offer page for new customers; enter your postcode to confirm it.
BT’s leaving-fee help is up to £300, paid as bill credit.
All prices rise each April or March by the amounts shown; 24-month totals assume a November 2026 start.
Prices were checked on 24 October 2026 and can change.
FAQ
Who owns Onestream broadband?
Onestream is run by Onestream Limited, based in Whiteley, Hampshire. Companies House lists Ridown Capital Limited as its controlling shareholder since July 2019, and Onecom Group held control before that.
Which network does Onestream use?
Onestream mainly uses Openreach, the same national network as BT, Sky and TalkTalk. Since taking over Cuckoo’s customers in 2026 it also has access to a wholesale platform that includes CityFibre and AllPoints Fibre lines.
How much is Onestream broadband?
On 24 October 2026, Onestream’s homepage showed its 40Mbps fibre plan at £18.50 a month. Full fibre prices only appear after you enter your address, and prices rise each April during the contract.
Is Onestream cheaper than BT?
Its entry plan is cheaper per month, but it is a slower 40Mbps service. BT’s Full Fibre 150 was £23.99 a month through our link on 24 October 2026, with £0 activation and up to £300 towards leaving fees.
What happened to Cuckoo broadband?
Cuckoo sold its customer base to Onestream in 2026 and stopped taking new orders from 4pm on 11 May 2026. Existing Cuckoo customers keep their connections on the same wholesale network, with Onestream running the service.
Was Onestream fined by Ofcom?
Yes. In December 2019 Ofcom fined Onestream £35,000 for switching at least 118 customers’ phone services without permission between April 2018 and January 2019. Onestream admitted the breach and agreed to settle.
Can I use my own router with Onestream?
Yes. Onestream’s help pages say you can use your own router as long as it supports the right connection type and settings, and it sends you the login details before your service goes live. You are then responsible for keeping that router’s security settings and firmware up to date.
Our verdict
Onestream is a fair budget option if you only need basic fibre at a low monthly price and are comfortable with a smaller provider. If full fibre reaches your home, BT’s Full Fibre 150 at £23.99 a month through our link gives you far more speed for a few pounds extra, with £0 activation and up to £300 towards leaving fees. Check your postcode, compare the 24-month total, and switch with One Touch Switch.
Check BT full fibre availability at your postcode
- Enter your postcode on BT’s offer page to confirm the £23.99 price at your address
- Your new provider handles the move with One Touch Switch
- No code needed; online offer with £0 activation
