Updated September 30, 2026 · TariffCue Editorial Team
OiSTER vs sim.de
What sets them apart
| Compare |  OiSTER |  sim.de |
|---|---|---|
| Host network | 3 | 1&1 |
| Price from | DKK 18 | €6.99 |
| 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 | 25 GB: 6.99 EUR/month, 25 GB, 1 month; 50 GB: 9.99 EUR/month, 50 GB, 24 months; Unlimited on demand: 19.99 EUR/month, unlimited, 24 months |
| Unlimited plan price | DKK 49 | €19.99 |
| Markets | DK | DE |
| Wi-Fi calling | Yes | Not confirmed |
| Roaming countries | Not confirmed | 33 |
| Multi-line discount | Yes | Not confirmed |
Same on both: Seller type (Mvno), SIM-only (Yes), 5G (Yes), eSIM (Yes), EU roaming (Included).
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Key differences
- OiSTER scores higher overall: 9.3 vs 8.9.
- Founded is lower at OiSTER: 2008 vs 2014.
- Billing: only sim.de offers Contract.
- Contract length: only sim.de offers 24.
- Markets: only OiSTER offers DK.
- Markets: only sim.de offers DE.
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.
sim.de
sim.de suits people in Germany who want a cheap sim only line with a monthly option and a fixed contract choice on the same tariff sheet. It runs on the 1&1 network, and its entry price of €6.99 sits well under the market median for entry pricing.
Score breakdown
| Area | OiSTER | sim.de |
|---|---|---|
| Cost | 9.8HigherEntry at DKK 18 a month and unlimited at DKK 49, though the Fri tale plans rise on renewal after an introductory rate. | 9.1Entry at €6.99 and unlimited at €19.99 both sit under the site medians of €9.30 and €23.19. |
| Offer | 9.1HigherSim only, eSIM and wifi calling all present, plus a multi line discount, 5G technology and data allowances of 10 to 1,000 GB. | 9.0Sim only, 5G and Esim are available, with included roaming across 33 countries and terms of 1 and 24. |
| Trust | 8.7HigherA long-standing operator: Hi3G Denmark ApS in DK since 2008, selling as an MVNO rather than a network. | 8.4Run by Drillisch Online GmbH since 2014, an mvno on the 1&1 network with support on email, chat and phone. |
Licences and countries
| Country | OiSTER | sim.de |
|---|---|---|
| Headquarters | Denmark | Germany |
How they place
| Ranking | OiSTER | sim.de |
|---|---|---|
| SIM-only deals | 92 of 416 | 24 of 416 |
| Cheap cell phone plans (MVNOs) | 52 of 137 | 14 of 137 |
| Phone plans with eSIM | 103 of 389 | 35 of 389 |
| Broadband providers | 35 of 124 | 7 of 124 |
| Broadband without a long contract | 14 of 46 | 4 of 46 |
Every fact side by side
| Fact | OiSTER | sim.de |
|---|---|---|
| Billing | Rolling | Contract, RollingCovers more |
| Contract length | 1 | 1, 24Covers more |
| Legal entity | Hi3G Denmark ApS | Drillisch Online GmbH |
| Headquarters | Denmark | Germany |
| Founded | 2008Lower | 2014 |
| Support channels | Phone, Email, Chat, Help centre | Email, Chat, Phone, Help centre |
Broadband
| Fact | OiSTER | sim.de |
|---|---|---|
| Technology | 5G | Fttc, Fttp |
| Top download speed (Mbps) | 25 to 954 | 1,000Higher |
| Upload speed (Mbps) | 23 to 94Higher | 5.8 to 40 |
| Setup fee | DKK 0 | €49.99 |
| Price after contract | DKK 279 | Not confirmed |
| Exit fee terms | Mobile broadband cancellable anytime with 30 days notice; 5G Internet 6-month tie-in | Not confirmed |
| Router | Vantiva Falcon 5G loan router included, must be returned | FRITZ!Box 7510, 7630 or 7690, from 4.99 EUR per month, optional |
| Data cap (GB) | 10 to 1,000 | Not confirmed |
| Address checker | https://oister.dk/internet/#tjekadresse | https://www.sim.de/glasfaser |
Where each stands against the rest
| Fact | OiSTER | sim.de | Median |
|---|---|---|---|
| Roaming countries | Not confirmed | 33lowest quarter | 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.
sim.de
Pros
- Entry pricing of €6.99 is below the site median of €9.30
- The Unlimited on demand plan costs €19.99, under the site median unlimited price of €23.19
- Contract terms run 1 and 24, so a plan can sit on a monthly term or a longer one
Cons
- The Unlimited on demand plan is tied to the longer of 1 and 24, so unlimited data is not offered on a monthly term
- Service runs in DE only, so the tariffs are not offered outside that market
- As an mvno, sim.de sells on the 1&1 network rather than owning it, unlike the network operators getesa, yesss! and Lonestar Cell MTN
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.
sim.de
Who it suits
- People in DE who want a data heavy sim only line without paying for a handset
- Travellers from DE who want roaming included and reach across 33 countries
- Households that want one provider offering both a short monthly term and a longer fixed contract
Who should look elsewhere
- Buyers outside DE, since the service is a single market
- People who want a handset bundled with the tariff, as the plans are sim only
- Buyers who want unlimited data on a rolling monthly basis, since the Unlimited on demand plan sits on the longer of 1 and 24
Country by country
| Country | OiSTER | sim.de |
|---|---|---|
| Denmark | Yes | No |
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.
sim.de
How much does a sim.de sim only plan cost to start with?+
The cheapest way in is the entry data plan at €6.99 per month, and it can run on a monthly term rather than a long contract. The larger data plan and the Unlimited on demand plan sit on the longer of 1 and 24 instead.
How much is unlimited data on sim.de?+
The Unlimited on demand plan costs €19.99 per month, and it is tied to the longer of the contract options, 1 and 24. That price sits under the site median unlimited price of €23.19, but the commitment is the part to weigh.
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