Updated September 30, 2026 · TariffCue Editorial Team
4th Utility vs OiSTER
4th Utility vs OiSTER: the differences
| Compare |  4th Utility |  OiSTER |
|---|---|---|
| Top download speed (Mbps) | 2,300Higher | 25 to 954 |
| Price from | £13.99 | DKK 18 |
| Reference plan prices | Full Fibre 1Gbps: GBP 10.00/mo for 4 months then GBP 23.00/mo, 1000Mbps, 24 months; Full Fibre 500Mbps: GBP 21.00/mo for 6 months then GBP 46.00/mo, 500Mbps, 24 months; Full Fibre 2.3Gbps: GBP 10.00/mo for 4 months then GBP 33.00/mo, 2300Mbps, 24 months | Basic: 25 kr/md, pay-as-you-go, no binding; Fri tale 100 GB: 18 kr/md promo then 109 kr/md, 100GB, 1 month; Fri tale Fri data: 49 kr/md promo then 199 kr/md, unlimited, 1 month |
| Setup fee | £0 | DKK 0 |
| Address checker | https://4thutility.co.uk/ | https://oister.dk/internet/#tjekadresse |
| Markets | GB | DK |
| Upload speed (Mbps) | Not confirmed | 23 to 94 |
| Price after contract | Not confirmed | DKK 279 |
| Mid-contract price rises | price rises each March in contract by GBP 4.00 | Not confirmed |
| Exit fee terms | Not confirmed | Mobile broadband cancellable anytime with 30 days notice; 5G Internet 6-month tie-in |
| Router | Not confirmed | Vantiva Falcon 5G loan router included, must be returned |
| Data cap (GB) | Not confirmed | 10 to 1,000 |
| Social tariff | Yes | Not confirmed |
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Key differences
- OiSTER scores higher overall: 9.3 vs 9.2.
- Top download speed (Mbps) is higher at 4th Utility: 2,300 vs 25 to 954.
- Support channels: only OiSTER offers Email.
- Founded is lower at OiSTER: 2008 vs 2017.
- Technology: only 4th Utility offers Fttp.
- Technology: only OiSTER offers 5G.
- Contract length: only 4th Utility offers 12, 24.
- Markets: only 4th Utility offers GB.
- Markets: only OiSTER offers DK.
Our verdict on each
4th Utility
4th Utility suits households inside its single UK market that want a full fibre line reaching 2,300 Mbps and no joining charge. Read the renewal figure before you commit, though: the entry price of £13.99 sits far below the ongoing cost, with the rule that price rises each March in contract by GBP 4.00.
OiSTER
OiSTER is a rolling Danish MVNO that suits households wanting a month-to-month bill, sim only plans and an unlimited option at DKK 49 a month. It is a weaker choice than the cheapest listings on entry price, so buyers shopping purely on the headline figure should look elsewhere first.
Score breakdown
| Area | 4th Utility | OiSTER |
|---|---|---|
| Cost | 9.6Entry price £13.99 with a setup fee of £0, against the rule that price rises each March in contract by GBP 4.00. | 9.8HigherEntry at DKK 18 a month and unlimited at DKK 49, though the Fri tale plans rise on renewal after an introductory rate. |
| Offer | 9.1Speeds to 2,300 Mbps on fibre, a social tariff and contract terms of 1, 12 and 24. | 9.1Sim only, eSIM and wifi calling all present, plus a multi line discount, 5G technology and data allowances of 10 to 1,000 GB. |
| Trust | 8.3Founded 2017 and based in GB, with support on phone, chat and help centre. | 8.7HigherA long-standing operator: Hi3G Denmark ApS in DK since 2008, selling as an MVNO rather than a network. |
Positions in our rankings
| Ranking | 4th Utility | OiSTER |
|---|---|---|
| Broadband providers | 43 of 124 | 35 of 124 |
| Broadband without a long contract | 18 of 46 | 14 of 46 |
Licences and countries
| Country | 4th Utility | OiSTER |
|---|---|---|
| Headquarters | United Kingdom | Denmark |
Additional countries for 4th Utility: 1. Additional countries for OiSTER: 1.
If neither fits
YouFibre has top download speed (mbps) at 8,000, against 2,300 for 4th Utility and 25 to 954 for OiSTER.
YouFibre reviewEvery fact side by side
| Fact | 4th Utility | OiSTER |
|---|---|---|
| Technology | Fttp | 5G |
| Contract length | 1, 12, 24Covers more | 1 |
| Legal entity | Not confirmed | Hi3G Denmark ApS |
| Headquarters | United Kingdom | Denmark |
| Founded | 2017 | 2008Lower |
| Support channels | Phone, Chat, Help centre | Phone, Email, Chat, Help centreCovers more |
Where each stands against the rest
| Fact | 4th Utility | OiSTER | Median |
|---|---|---|---|
| Top download speed (Mbps) | 2,300above the median | 25 to 954lowest quarter | 1,000 |
| Upload speed (Mbps) | Not confirmed | 23 to 94lowest quarter | 900 |
| Data cap (GB) | Not confirmed | 10 to 1,000below the median | 15 |
Median across 116 listed providers.
Pros and cons
4th Utility
Pros
- Entry price £13.99 places 4th Utility at 9 of 95 on price from, close to the top of that ranking.
- The setup fee is £0, and the provider sits at 1 of 86 on that measure.
- Speeds of 2,300 Mbps on full fibre sit well above the median top speed of 1,000 Mbps.
Cons
- Contract prices move upward under the rule that price rises each March in contract by GBP 4.00, so a long term bills more the longer it runs.
- The listed reference plan prices open low and renew much higher, so the introductory months are the cheapest part of the deal.
- Service is limited to GB, so it is not an option for readers outside that market.
OiSTER
Pros
- The unlimited Fri tale Fri data plan is listed at DKK 49 a month, which ranks 13 of 173 on unlimited price.
- Rolling billing at 1 month, with Basic available pay-as-you-go and no binding period.
- Sim only, eSIM, wifi calling and a multi line discount are all available, on 5G technology.
Cons
- The DKK 18 entry price ranks 43 of 258 on the listings compared, so entry pricing is mid-table rather than the cheapest on offer.
- The Fri tale plans are published at a promotional rate before a higher standard rate, so the ongoing cost on the same plan name is the figure to budget.
- Coverage is limited to DK, so residents outside that market have nothing here to switch to.
Who each suits
4th Utility
Who it suits
- Households inside its single market that want an entry price of £13.99 with no setup charge.
- Heavy users who need 2,300 Mbps on a full fibre line for a shared home or working from home.
- People on low incomes looking for a social tariff, and buyers who want the choice of terms in 1, 12 and 24.
Who should look elsewhere
- Readers outside the UK, since 4th Utility covers GB while EarthLink lists fttp, 5G and satellite and can reach homes fibre does not.
- Anyone chasing the biggest headline speed, because Abissnet advertises 10,000 Mbps against 4th Utility's 2,300 Mbps.
- Buyers who want a cable option, since Astound sells cable and fttp while 4th Utility is fibre only.
OiSTER
Who it suits
- Households in DK that want a rolling monthly bill and can cancel mobile broadband with notice.
- Readers who want unlimited data at DKK 49 a month rather than the cheapest possible entry price.
- Families running more than one line, since a multi line discount applies alongside eSIM setup for a new handset.
Who should look elsewhere
- Anyone who wants to buy from the network operator instead of an MVNO: GETESA, Lonestar Cell MTN and yesss! all sell as networks.
- Shoppers ranking purely on the lowest price from, since DKK 18 sits at position 43 of 258 and yesss! or GETESA belong on the same shortlist for that column.
Country by country
| Country | 4th Utility | OiSTER |
|---|---|---|
| Denmark | No | Yes |
| United Kingdom | Yes | No |
Questions about each
4th Utility
What is the cheapest way in to 4th Utility?+
The entry point is the social tariff at £13.99 a month, and the setup fee is £0, so joining does not carry a joining charge. The full fibre plans are sold separately and start at a higher rate, so the standard plans are the route for anyone not eligible for the social tariff.
Do 4th Utility prices stay the same after the first few months?+
Not on the full fibre plans. The listed reference plan prices open at a low introductory rate for a handful of months, then step up to a renewal rate for the rest of the term, with the entry level plan renewing highest in the range. Add the rule that price rises each March in contract by GBP 4.00 and the bill keeps climbing.
OiSTER
What is the cheapest OiSTER plan and what does it cost?+
The entry price is DKK 18 a month. Basic is the pay-as-you-go option, billed on usage with no binding period, so it works for light use and for anyone who does not want to be tied in. The two Fri tale plans sit above it, one with a capped allowance and one unlimited, so the entry figure suits a phone that lives mostly on wifi.
What will I pay when an introductory price runs out?+
The Fri tale plans are published at a promotional rate first and a higher standard rate afterwards on the same plan name, so the ongoing cost is the standard rate, not the introduction. Basic sidesteps that because it is pay-as-you-go. The unlimited plan, Fri tale Fri data, is listed at DKK 49 a month on the published pricing.