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- Calls: 5 hours
- Data: 5 GB
- SMS: Unlimited
- Setup fee: 0 DKK
- Contract: None
- Calls: 0.20 DKK / min
- Data: 1.4 DKK / MB
- SMS: 0.60 DKK
- Subscription: 19 DKK
- Setup fee: 0 DKK • Contract: None
- Calls: 5 hours
- Data: 3 GB
- SMS: Unlimited
- Setup fee: 0 DKK
- Contract: None
Oister is a popular low-cost mobile operator in Denmark, known for providing affordable mobile subscriptions and mobile broadband on the 3 (Tre) network. As a digital-first provider, Oister focuses on delivering simple, budget-friendly plans primarily through its online platform, making it a strong contender for residents, expats, and long-term visitors looking for value.
A Digital-Only Brand
Oister operates without physical stores, which is a key part of its cost-saving strategy. All interactions, from signing up and managing your account to receiving customer support, are handled online. This model allows Oister to pass on significant savings to its customers through highly competitive pricing on data and talk time.
Part of the 3 Denmark Network
Oister is not an independent company but a brand owned by Hi3G Denmark, which operates the 3 (Tre) mobile network. This relationship is crucial because it means Oister customers use the same infrastructure as 3’s own customers. You get access to a national network without paying the premium price often associated with the main network operators.
Oister Mobile Plans (Mobilabonnementer)
Oister’s product portfolio is centered around simplicity and value. The plans are designed to be straightforward, with a clear focus on generous data allowances and unlimited talk time in many cases. The offerings are primarily post-paid monthly subscriptions rather than traditional pay-as-you-go prepaid SIMs.
Core Mobile Subscriptions
The main product line consists of monthly mobile plans that bundle data, talk time, and SMS/MMS. Most plans now come with unlimited talk time (fri tale) within Denmark, making them ideal for users who make frequent calls. The primary differentiator between plans is the amount of mobile data included, ranging from smaller packages for light users to very large ones for heavy streamers and downloaders.
All of Oister’s mobile subscriptions include EU roaming. This allows you to use your phone in other EU/EEA countries without extra cost, up to a certain data limit specified by a “fair use” policy. The amount of data you can use while roaming in the EU is typically a portion of your total Danish data allowance.
Data-Only Plans (Mobilt Bredbånd)
For users who need internet for a tablet, laptop, or as a home internet solution, Oister offers mobile broadband (mobilt bredbånd). These are data-only SIM cards that provide large data packages, often several hundred gigabytes or even unlimited, intended for use in a 4G/5G router or a compatible device. This can be an excellent flexible internet solution for expats who don’t want to commit to a fixed-line broadband contract.
eSIM Availability
Oister supports eSIM, which is a digital SIM that allows you to activate a cellular plan without needing a physical SIM card. This is particularly convenient for owners of modern smartphones (like recent iPhones, Google Pixels, and Samsung Galaxy models) and for those who want to use a dual-SIM setup. You can typically order an eSIM during signup or switch from a physical SIM to an eSIM through the “Mit Oister” self-service portal.
Network Coverage and Performance
Since Oister runs on the 3 network, its coverage and speed are identical to what 3’s own customers experience. The quality of your service will depend entirely on the strength of the 3 network in your specific location.
The 3 (Tre) Network Infrastructure
The 3 network is one of the three major mobile networks in Denmark, alongside TDC NET and the shared TT-network (Telenor/Telia). It is known for being a modern network with a strong focus on data speeds and capacity, particularly in urban and suburban areas. It has invested heavily in upgrading its infrastructure to support 4G/LTE and 5G technologies.
4G/LTE and 5G Coverage
Oister provides full access to 3’s 4G network, which covers the vast majority of the Danish population. In recent years, 3 has been aggressively rolling out its 5G network, and most Oister plans now include 5G access at no extra cost where coverage is available. 5G offers significantly faster speeds and lower latency, enhancing experiences like streaming high-definition video, online gaming, and large file downloads.
Coverage in Urban vs. Rural Areas
The 3 network is generally considered excellent in Copenhagen, Aarhus, Odense, Aalborg, and other cities and densely populated towns. However, in some rural and remote parts of the country, its coverage can be less comprehensive than that of TDC NET. If you live or work in a rural area, it is highly advisable to check the network’s coverage map before committing to Oister.
Tip: Check Coverage Before You Buy
Before signing up for Oister, use the official 3 Denmark network coverage map (dækningskort) available on their website. You can enter a specific address to check the expected indoor and outdoor signal strength for 2G, 4G, and 5G. This simple step can save you from potential frustration if the coverage is weak at your home or workplace.
Signing Up for Oister as an Expat or Tourist
The process of getting an Oister subscription is straightforward, but it has specific requirements that are important for non-Danes to understand.
Online-Only Registration
You must sign up on the Oister website. During the process, you will select your desired plan and provide personal information. The SIM card (or eSIM activation details) will then be sent to your Danish address. You cannot buy an Oister SIM card in a physical shop or at the airport.
CPR Number and Address Requirement
To get a monthly subscription (abonnement) with Oister, you will almost always need a Danish CPR number (personal identification number) and a valid Danish address. The CPR number is used for identity verification and a credit check. This makes Oister’s primary offerings best suited for expats and residents, rather than short-term tourists.
If you do not have a CPR number, it is very difficult to get a standard post-paid plan. While some providers in Denmark offer prepaid SIMs with less stringent ID checks (often just requiring a passport), Oister’s business model is built around monthly contracts tied to a verified Danish identity.
Payment Methods
Payment for Oister subscriptions is typically handled via automatic card payments. You will need to register a payment card (betalingskort) in the “Mit Oister” self-service portal. Oister accepts Dankort, Visa, MasterCard, and other common credit/debit cards. The monthly fee is then automatically deducted from your card.
Plan Features and Administration
Oister’s appeal lies not just in its price but also in the flexibility and user-friendly management of its services.
No Binding Period (Ingen Binding)
A major advantage of Oister is that most of their plans come with no binding period (“ingen binding”). This means you are not locked into a long-term contract. You can cancel your subscription with a notice period of just 30 days. This flexibility is ideal for expats who may not know how long they will be staying in Denmark.
“Mit Oister” Self-Service Portal
Everything related to your account is managed through the “Mit Oister” (My Oister) area on the website or via their mobile app. Here, you can:
- Monitor your data, talk, and SMS usage in real-time.
- Change your subscription to a larger or smaller plan.
- Purchase extra data if you run out.
- View and download your bills (regninger).
- Update your personal information and payment details.
- Contact customer support.
Customer Support
Reflecting its digital model, Oister’s customer support is primarily online. You can contact them via a contact form on their website or through a chat service. They also have a customer service phone number, but wait times can vary, and the company encourages users to find answers first in their extensive FAQ section or use the digital self-service options.
Oister+ Loyalty Program
Oister+ is a loyalty program that gives customers access to various discounts and special offers on experiences, products, and services. This can include discounts on cinema tickets, restaurant deals, streaming services, and more. It’s a value-added benefit that exists on top of the core mobile service, rewarding long-term customers.
Example of Oister Mobile Plans
To give a concrete idea of their offerings, here is a table illustrating typical Oister plans. Note that prices and data allowances change frequently due to promotions, so this is for illustrative purposes only.
| Plan Feature | Small Plan | Medium Plan | Large Plan |
|---|---|---|---|
| Data (in Denmark) | 30 GB | 100 GB | Free Data (Unlimited) |
| Talk Time | Unlimited | Unlimited | Unlimited |
| Data in EU | 15 GB | 25 GB | 40 GB |
| 5G Access | Included | Included | Included |
| Binding Period | None | None | None |
| Approx. Price (DKK/mo.) | 99 DKK | 129 DKK | 179 DKK |
Potential Downsides and Considerations
While Oister offers compelling value, there are a few potential drawbacks to consider, especially for newcomers to Denmark.
Strict CPR Number Requirement
The reliance on a CPR number for registration is the single biggest barrier for tourists or individuals who have just arrived in Denmark and are still waiting for their official paperwork. If you need a mobile number immediately upon arrival, you will likely need to look for a prepaid SIM card from another provider first.
Network Gaps in Remote Locations
As mentioned, the 3 network, while robust in populated areas, may not be the strongest choice for those living in very rural parts of Denmark. Competing networks, particularly TDC NET, often have a reputation for more comprehensive coverage in the countryside. Always check the coverage map for your specific addresses.
Digital-First Customer Service Model
For users who prefer resolving issues by speaking to a person in a store or having immediate phone access to support, Oister’s online-focused model can be a disadvantage. While they do offer phone support, the primary channels are digital, which may not suit everyone’s preference for customer service.