OiSTER review

Updated September 30, 2026 · TariffCue Editorial Team · Facts checked September 30, 2026

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Our verdict

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.

Key facts

Best for
Rolling month-to-month mobile plans in Denmark with an affordable unlimited option.
Seller type
Mvno (Source, checked September 30, 2026)
Host network
3 (Source, checked September 30, 2026)
SIM-only
Yes (Source, checked September 30, 2026)
Price from
DKK 18 (Source, checked September 30, 2026)
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 (Source, checked September 30, 2026)
Unlimited plan price
DKK 49 (Source, checked September 30, 2026)
5G
Yes (Source, checked September 30, 2026)
eSIM
Yes (Source, checked September 30, 2026)
Wi-Fi calling
Yes (Source, checked September 30, 2026)
EU roaming
Included (Source, checked September 30, 2026)
Multi-line discount
Yes (Source, checked September 30, 2026)
Markets
DK (Source, checked September 30, 2026)
Legal entity
Hi3G Denmark ApS (Source, checked September 30, 2026)
Headquarters
Denmark (Source, checked September 30, 2026)
Founded
2008 (Source, checked September 30, 2026)
Support channels
Phone, Email, Chat, Help-centre (Source, checked September 30, 2026)
Billing
Rolling
Contract length
1
Official website
oister.dk

Broadband

Top download speed (Mbps)
25 to 954 (Source, checked September 30, 2026)
Upload speed (Mbps)
23 to 94 (Source, checked September 30, 2026)
Price from
DKK 18 (Source, checked September 30, 2026)
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 (Source, checked September 30, 2026)
Setup fee
DKK 0 (Source, checked September 30, 2026)
Price after contract
DKK 279 (Source, checked September 30, 2026)
Exit fee terms
Mobile broadband cancellable anytime with 30 days notice; 5G Internet 6-month tie-in (Source, checked September 30, 2026)
Router
Vantiva Falcon 5G loan router included, must be returned (Source, checked September 30, 2026)
Data cap (GB)
10 to 1,000 (Source, checked September 30, 2026)
Address checker
https://oister.dk/internet/#tjekadresse (Source, checked September 30, 2026)
Markets
DK (Source, checked September 30, 2026)
Legal entity
Hi3G Denmark ApS (Source, checked September 30, 2026)
Headquarters
Denmark (Source, checked September 30, 2026)
Founded
2008 (Source, checked September 30, 2026)
Support channels
Phone, Email, Chat, Help-centre (Source, checked September 30, 2026)
Technology
5G
Contract length
1

Pros and cons

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.
  • Roaming in the EU is included rather than charged as an extra, and the setup fee is free.
  • Support runs on phone, email and chat, giving phone, email, chat and a help centre for households that want a person rather than a ticket.

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.
  • The home internet product carries a tie-in period and a post contract price of DKK 279, and the included Vantiva Falcon 5G loan router included, must be returned has to be returned when the service ends.
OiSTER

Ready to try OiSTER?

Scored 9.3 / 10 by TariffCue.

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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.

Pricing

Every published plan runs on a month-to-month footing, so at OiSTER the entry price and the price you renew at are the same number rather than a headline that resets later. Basic is pay-as-you-go with no binding period. The two Fri tale plans work the other way round: each is published at a promotional rate that is replaced by a higher standard rate on the same plan name. Entry pricing starts at DKK 18 a month. The unlimited plan, Fri tale Fri data, is listed at DKK 49 a month, and the data-capped Fri tale plan sits between the two, which leaves a wide gap between the cheapest way in and the unlimited option. The practical reading for a household doing the sums: budget for the standard rate on whichever Fri tale plan you pick, not for the promotional rate, and treat Basic as the option with no promotional step at all.

Where it sits among rivals

On the entry price, OiSTER sits at position 43 of 258 across the listings compared, which places it well down the cheapest table rather than at the front of it. A reader sorting purely by the lowest monthly figure would move past it. The unlimited picture reverses that. On the unlimited price the brand ranks 13 of 173, a much stronger position and close to the front of the field. The gap between those two rankings is the most useful thing about this brand in a comparison, and it is worth checking which column your own shortlist is sorted by. For anyone weighing this against GETESA, Lonestar Cell MTN or yesss!, the choice is between the cheapest headline price and unlimited data at a low monthly figure. The first favours other listings in the table, while the second puts OiSTER near the front, and a household that streams heavily and travels gains most from the second.

What it does well

Every plan is sim only, which suits anyone bringing their own handset or keeping a number they already have, and Basic can be used pay-as-you-go with no binding period. An eSIM is available, so a new phone can be set up without waiting for a plastic card, and wifi calling is available, so calls can move onto a fixed line when the mobile signal is weak. The plans run on 5G technology, and a multi line discount applies to households with more than one line, so a family can bring its monthly figure down without moving anyone to a different provider. Taken together, the sim only setup, the eSIM option, wifi calling, the multi line discount and 5G cover most of what a household checks on a mobile plan before it commits.

How OiSTER compares

Where OiSTER is available

Available
Denmark

Countries from the brand (Source, checked September 30, 2026)

Frequently asked questions

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.

Do I have to sign a long contract with OiSTER?+

No long tie-in on the mobile plans, which run on a rolling basis at 1 month, and mobile broadband can be cancelled with notice. The separate home internet product does carry a tie-in period, and once that period is over the monthly figure is DKK 279, so check which product you are ordering before reading a headline price.

How fast is the OiSTER mobile broadband?+

Download speeds run 25 to 954 Mbps, with upload at 23 to 94 Mbps, and the service uses 5G technology. For context, the median top download speed across the listings compared is 1,000 Mbps, so a household moving off a fixed line should expect a step down and plan around it.

Is a router included and is there a setup fee?+

The setup fee is free, and the home internet product includes a Vantiva Falcon 5G loan router included, must be returned. Because the router is on loan rather than sold, it has to come back if the service ends. The mobile plans are sim only, so the router applies to the home internet product and not to a phone line.

Can I use an eSIM, and is EU roaming included?+

An eSIM is available alongside a physical SIM, and wifi calling works on the plans, so a new handset can be set up without a card in the post. Roaming in the EU is included rather than charged as an extra, which matters for anyone who uses the phone away from DK on a regular basis.

Where does OiSTER run and who is behind it?+

The brand runs in Denmark, and the legal entity is Hi3G Denmark ApS, based in Denmark. It has traded since 2008 and sells as an MVNO rather than a network, so its coverage comes from a host network instead of owned masts. Residents outside that market would need a different provider.

How do I get help from OiSTER?+

Support runs on phone, email and chat, so a help centre, live chat, email and phone are all available, and a household running more than one line can ask about the multi line discount at the same time. As an MVNO, service is handled by the brand itself rather than by the host network's own support desk.

Sources

Compiled from 10 source pages, checked September 30, 2026. We did not open an account.

OiSTER

OiSTER

Rolling month-to-month mobile plans in Denmark with an affordable unlimited option.

9.3/10See alternatives

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