Updated September 30, 2026 · TariffCue Editorial Team
OiSTER vs RED by SFR
What sets them apart
| Compare |  OiSTER |  RED by SFR |
|---|---|---|
| Seller type | Mvno | Network |
| Host network | 3 | SFR |
| Price from | DKK 18 | €1.99 |
| Reference plan prices | 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 | 1Go: 1.99EUR per month, 1GB, no commitment; 120Go 5G: 12.99EUR per month, 120GB, no commitment; 250Go 5G Voyage: 15.99EUR per month, 250GB, no commitment |
| EU roaming | Included | Fair use |
| Markets | DK | FR |
| Unlimited plan price | DKK 49 | Not confirmed |
| Wi-Fi calling | Yes | Not confirmed |
| Roaming countries | Not confirmed | 137 |
| Data rollover | Not confirmed | No |
| Hotspot sharing | Not confirmed | Yes |
| Multi-line discount | Yes | Not confirmed |
Same on both: SIM-only (Yes), 5G (Yes), eSIM (Yes).
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Key differences
- RED by SFR scores higher overall: 9.4 vs 9.3.
- Support channels: only OiSTER offers Email.
- Support channels: only RED by SFR offers Community.
- Markets: only OiSTER offers DK.
- Markets: only RED by SFR offers FR.
Our verdict on each
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.
RED by SFR
RED by SFR suits readers in FR who want a sim only plan on 1 month terms with rolling billing and no commitment. Data does not roll over and EU roaming runs on fair use terms, so the low entry price fits light users and short stays rather than heavy data habits.
Score breakdown
| Area | OiSTER | RED by SFR |
|---|---|---|
| Cost | 9.8Entry at DKK 18 a month and unlimited at DKK 49, though the Fri tale plans rise on renewal after an introductory rate. | 9.8Entry price of €1.99 a month sits well under the site median of €9.30, and it ranks 32 of 258 brands on entry price. |
| Offer | 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. | 9.1Each plan carries 5G, an eSIM and hotspot sharing, with the larger allowances aimed at streaming, plus roaming in 137 countries. |
| Trust | 8.7A long-standing operator: Hi3G Denmark ApS in DK since 2008, selling as an MVNO rather than a network. | Not confirmed |
How they place
| Ranking | OiSTER | RED by SFR |
|---|---|---|
| SIM-only deals | 92 of 416 | 69 of 416 |
| Phone plans with eSIM | 103 of 389 | 83 of 389 |
| Broadband providers | 35 of 124 | 29 of 124 |
| Broadband without a long contract | 14 of 46 | 10 of 46 |
Availability and regulation
| Country | OiSTER | RED by SFR |
|---|---|---|
| Headquarters | Denmark | France |
Additional countries for OiSTER: 1. Additional countries for RED by SFR: 1.
Sources behind this comparison
OiSTER
- oister.dk: 18 facts, checked September 30, 2026
RED by SFR
- red-by-sfr.fr: 17 facts, checked September 30, 2026
Every fact side by side
| Fact | OiSTER | RED by SFR |
|---|---|---|
| Billing | Rolling | Rolling |
| Contract length | 1 | 1 |
| Legal entity | Hi3G Denmark ApS | SOCIETE FRANCAISE DU RADIOTELEPHONE - SFR |
| Headquarters | Denmark | France |
| Founded | 2008 | Not confirmed |
| Support channels | Phone, Email, Chat, Help centre | Chat, Phone, Help centre, Community |
Broadband
| Fact | OiSTER | RED by SFR |
|---|---|---|
| Technology | 5G | Fttp, Cable, 5GCovers more |
| Top download speed (Mbps) | 25 to 954 | 2,000Higher |
| Upload speed (Mbps) | 23 to 94 | 1,000Higher |
| Setup fee | DKK 0 | €0 to €29 |
| Price after contract | DKK 279 | Not confirmed |
| Exit fee terms | Mobile broadband cancellable anytime with 30 days notice; 5G Internet 6-month tie-in | Termination fee 59 EUR fibre/THD, 29 EUR Box 5G |
| Router | Vantiva Falcon 5G loan router included, must be returned | SFR Box 7, SFR Box 8 option, Box 5G |
| Data cap (GB) | 10 to 1,000 | Not confirmed |
| Address checker | https://oister.dk/internet/#tjekadresse | https://www.red-by-sfr.fr/offres-internet/eligibilite-fibre-adsl-vdsl/ |
Where each stands against the rest
| Fact | OiSTER | RED by SFR | Median |
|---|---|---|---|
| Unlimited plan price | DKK 49lowest quarter | Not confirmed | DKK 289 |
| Roaming countries | Not confirmed | 137above the median | 100 |
Median across 176 listed providers.
Pros and cons
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.
RED by SFR
Pros
- Sim only plans, so a new line can be activated on its own without a handset in the same order.
- Billing is rolling on 1 month terms, so a line can end without serving a long fixed period.
- The host network is SFR, and the same provider also sells fixed lines at 2,000 Mbps with routers SFR Box 7, SFR Box 8 option, Box 5G.
Cons
- Data rollover is not offered, so data left at the end of a month expires instead of carrying over.
- EU roaming runs on fair use terms, so frequent travel across Europe is not a flat included allowance.
- Billing is rolling only, while GETESA (prepaid and contract) and Lonestar Cell MTN (contract and prepaid) also list contract billing, so no committed term sits behind a lower monthly figure.
Who each suits
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.
RED by SFR
Who it suits
- Readers in FR who pay as they go and would rather not serve a fixed minimum term
- People who want 5G, an eSIM and hotspot sharing on one bill without a handset
- Households after mobile and fixed lines from one provider, with fibre at 2,000 Mbps and a choice of SFR Box 7, SFR Box 8 option, Box 5G
Who should look elsewhere
- Readers who want a contract term, since GETESA (prepaid and contract) and Lonestar Cell MTN (contract and prepaid) both list contract billing while this brand bills rolling
- Readers whose address has weak reception on SFR, since yesss! runs on A1 instead
Country by country
| Country | OiSTER | RED by SFR |
|---|---|---|
| Denmark | Yes | No |
| France | No | Yes |
Questions about each
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.
RED by SFR
What does the entry plan cost and what comes with it?+
The entry plan is priced at €1.99 a month and runs on 1 month terms with rolling billing, and it carries a small data allowance. Larger plans sit above it, all on no commitment terms, with allowances sized for streaming and heavier use. The price list holds the full ladder to compare.
Do I have to sign a minimum term?+
No commitment is attached to any of the plans, and billing is rolling, so the arrangement can be stopped without serving a long fixed period. That is the main difference from brands such as GETESA, where billing covers prepaid and contract, and Lonestar Cell MTN, which lists contract and prepaid.
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