Had a bit of trouble buying Sim with the website. But Jakob from customer service team helped me out a lot and set me up with the preferred number and mobile subscription. He even helped out for esim... See more
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I have been an Oister customer for 4 years. It was good in the beginning, and my current review doens't reflect that early period. But lately, they have lost their relationship with their customers.... See more
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I’m extremely happy with my experience with Oister. I called yesterday to sign up for their 5G internet service, and to my surprise, the router arrived today. The setup was quick and easy, and m... See more
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I must apologize to Oister for my previous posts. The service is really excellent, and my mistake was that I abandoned the 5G router and used a regular one, designed only for 4G. Yes, I switched to an... See more
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Company details
About OiSTER
Written by the company
OiSTER er et lavprisselskab med fokus på mobiltelefoni og mobilt bredbånd. Grundlaget for OiSTER har altid været at gøre det nemt og billigt for OiSTERs kunder. Det forsøger vi konstant at leve op til, hvorfor vi er stolte af vores slogan ’Bedst til prisen’.
Mobilt Bredbånd hos OiSTER:
OiSTERs mobile bredbånd er den bedste lavpris løsning på trådløst internet, som du kan tage med dig overalt i Danmark. Vi kalder det Danmarks nemmeste internet, fordi det er nemt og hurtigt at installere. Desuden benytter vi 3s prisvindende netværk.
Mobiltelefoni hos OiSTER:
OiSTER blev først kendt for at levere Danmarks bedste mobile bredbånd til prisen. Det er den samme tankegang, der danner grundlaget for mobiltelefoni hos OiSTER, nemlig at du får mobiltelefoni på landets bedste mobilnetværk - nemt, enkelt, overskueligt og ikke mindst til en konkurrencedygtig pris.
Grundidéen for OiSTER er, at dit mobilabonnement er gennemskueligt og uden binding. På oister.dk kan du nemt følge dit forbrug og eventuelt ændre dit mobilabonnement, hvis dine behov ændrer sig.
Mobilt Bredbånd hos OiSTER:
OiSTERs mobile bredbånd er den bedste lavpris løsning på trådløst internet, som du kan tage med dig overalt i Danmark. Vi kalder det Danmarks nemmeste internet, fordi det er nemt og hurtigt at installere. Desuden benytter vi 3s prisvindende netværk.
Mobiltelefoni hos OiSTER:
OiSTER blev først kendt for at levere Danmarks bedste mobile bredbånd til prisen. Det er den samme tankegang, der danner grundlaget for mobiltelefoni hos OiSTER, nemlig at du får mobiltelefoni på landets bedste mobilnetværk - nemt, enkelt, overskueligt og ikke mindst til en konkurrencedygtig pris.
Grundidéen for OiSTER er, at dit mobilabonnement er gennemskueligt og uden binding. På oister.dk kan du nemt følge dit forbrug og eventuelt ændre dit mobilabonnement, hvis dine behov ændrer sig.
OiSTER
Written by the company
Contact info
Fadet 4, 1799, København V, Denmark
- 70313070
- kundeservice@oister.dk
- www.oister.dk
4.1
Great
29K reviews
Asks customers to review
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Took 1 day to regret
It’s been 3 days with Oister. They’ve already charged me extra for something that is supposed to be included in my subscription, the website stopped working for an entire day out of the three I’ve been with them, and they’ve kept me waiting on the phone for over an hour so far (and I’m still waiting). On top of that, none of their services are available in English: not the website, not the emails, and not the option to be assisted in English over the phone. Let’s see whether I even make it through the first week without canceling.
10 April 2026
Reply from OiSTER
Hi Margot
Thank you for sharing your experience with us. It sounds like a very frustrating start, especially with issues related to billing, access to the website, and long waiting times on the phone – this is certainly not the experience we want to give new customers.
We would very much like to take a closer look at your case and understand what happened. If you’re willing, please feel free to write to us at trustpilot@oister.dk with your details, so we can follow up and learn from your feedback.
Thank you for taking the time to tell us about this.
Kind regards
Mikkeline
The person I talked with was a gentle…
The person I talked with was a gentle soul. She was really understanding person.
23 March 2026
Reply from OiSTER
Hi Wilfred,
Thank you so much for your wonderful review! It’s fantastic to hear that you had a great experience with our team. Your feedback means a lot, and we truly appreciate you sharing it with us 😊
Best regards,
Cecilie
Good rates.
19 March 2026
Reply from OiSTER
Hi Catherine
Thank you for your review.
We’re happy to hear that you’re satisfied with us.
We truly appreciate your feedback and hope you’ll continue to enjoy your subscription. 😊
Best regards
Josepha
Reply from OiSTER
Hi Lúdvík,
Thank you so much for your great review! We’re really happy to hear that you see us as a good company. Your feedback means a lot to us 😊
Best regards,
Cecilie
Reply from OiSTER
Hej Misghina
Tusind tak for din anmeldelse. Det er skønt at høre, at du oplever både god kundeservice og en fair pris – det betyder meget for os, at vi kan leve op til dine forventninger 😊
Tak fordi du deler din oplevelse med os.
De bedste hilsner
Katharina
Good service 💯
18 March 2026
Reply from OiSTER
Hej David
Tusind tak for din anmeldelse.
Det er skønt at høre, at du oplever god service hos os.
Vi sætter stor pris på din feedback og håber, du fortsat bliver glad for dit abonnement. 😊
De bedste hilsner
Josepha
Reply from OiSTER
Hi Jóan,
Thank you so much for your review. It’s wonderful to hear that you find our website easy to navigate - it means a lot to us that everything feels simple and straightforward for our customers.
We really appreciate you sharing your experience with us 😊
Best regards,
Katharina
Reply from OiSTER
Hej
Tusind tak for din flotte anmeldelse. Det glæder os virkelig at høre, at du oplever god service hos os.
Vi sætter stor pris på, at du har taget dig tid til at dele din oplevelse.
De bedste hilsner
Nora 😊
worse Service,
Bad Data Service,
I am writing to make a formal complaint about the extremely slow internet service on my SIM card. The connection is so poor that I cannot even watch basic videos on Facebook or YouTube. This situation has caused me significant inconvenience in my daily use.
When I contacted your colleague about this problem, I was told that I must either pay for six months or wait until the binding period ends. I find this response unacceptable. I am paying for a service that I am not able to use properly.
Your advertisements claim to provide one of the best networks, but my experience has been the opposite. The network quality I receive is very poor, and it does not meet reasonable service expectations.
I request that you investigate this issue and provide a proper solution as soon as possible. If the service cannot be improved, I expect a fair resolution, including the possibility of terminating the contract without additional charges.
Sincerely,
5 March 2026
Unprompted review
Reply from OiSTER
Hello Amir,
Thank you for your review and for taking the time to share your experience. We fully understand that it’s frustrating when the internet connection does not meet expectations and affects your daily life. We also know that it can feel unsatisfactory when the options to cancel or change the subscription are limited during the binding period.
We would very much like to hear more about your experience so we can learn from your feedback and look into whether there is anything we can do to help you further. You are welcome to write to us at trustpilot@oister.dk
so we can take a closer look at your case.
Kind regards,
Mikkeline
Alt var godt
2 June 2025
Reply from OiSTER
Hej Caroline
Tusind tak for de fem stjerner og din korte, positive tilbagemelding. Det betyder meget for os at høre, at alt har levet op til dine forventninger.
Vi sætter stor pris på, at du har taget dig tid til at dele din oplevelse.
De bedste hilsner
Mikkeline
So far I am a very Happy customer
So far I am a very Happy customer. Great deals, very good prices and great phone/data connection. Also good website interface with many options and fairly logical setup.
4 November 2025
Reply from OiSTER
Hi Brian,
Thank you very much for the five stars and your positive review. We’re happy to hear that you’re pleased with our prices, the connection, and the options available on our website. We truly appreciate you taking the time to share your experience with us.
We hope you continue to be satisfied with us 😊
Best regards,
Mikkeline
Reply from OiSTER
Hi Ravindra,
Thank you very much for your review and your kind words. We’re happy to hear that you’ve had a good experience with your SIM card after starting to use it.
We truly appreciate you taking the time to share your experience with us 😊
Best regards,
Mikkeline
Quick and easy
Oister has been great, quick and easy to switch to their service via digital sim card, it can be done in an instant, which is great if you have someone stalking your phone.
2 August 2025
Reply from OiSTER
Hi Megan
Thank you for your review.
We’re glad to hear that switching to OiSTER via the digital SIM card was quick and easy, and that it worked instantly for you. We really appreciate you sharing your feedback.
Best regards,
Mikkeline
Best customer care service and give…
Best customer care service and give enough time to get the solution
19 February 2026
Reply from OiSTER
Hi Emmanuel
Thank you for your review.
We’re glad to hear that you find our customer care service great and that we give enough time to find the right solution. We really appreciate you sharing your experience with us.
Best regards,
Mikkeline
Reply from OiSTER
Hej Danut-Marian
Tusind tak for din skønne anmeldelse. Det gør os virkelig glade at høre, at du synes OiSTER er fantastisk.
Vi sætter stor pris på, at du deler din oplevelse med os 😊
De bedste hilsner
Mikkeline
If I could give it 0 stars I would
If I could give it 0 stars I would. Absolute terrible customer service. They kept on taking money from my account months after I unsubscribed. Charging me 2000 dkk for a router I never recieved, and said that I used 300gbs of data on a plan I never wanted which only has 5gbs of data. The worst mobile company in the world.
2 February 2026
Unprompted review
Reply from OiSTER
Hi Richard,
Thank you for your review and for sharing your experience with us. We fully understand how frustrating it can be to encounter issues with payments, equipment, and customer service when you have tried to cancel your subscription.
We would very much like to look into your case further so we can understand what went wrong and learn from your feedback. You are welcome to contact us at trustpilot@oister.dk
, and we will take a closer look at your experience and help you move forward.
Kind regards,
Mikkeline
Jeg har bestilt 2month offer by 19…
Jeg har bestilt 2month offer by 19 krone but ojster reduce 110 krine from my account
27 January 2026
Reply from OiSTER
Hej Fatemeh
Tak for din anmeldelse og for at dele din oplevelse med os. Vi kan godt forstå, at det er frustrerende at opleve at blive trukket et højere beløb end forventet, når du har bestilt et tilbud til en bestemt pris.
Vi vil meget gerne undersøge, hvad der er sket i din sag, så vi kan give dig en forklaring og hjælpe dig videre. Du er meget velkommen til at skrive til os på trustpilot@oister.dk med dine oplysninger, så vi kan se nærmere på det sammen med dig.
De bedste hilsner
Mikkeline
Reply from OiSTER
Hi Jun
Thank you so much for your wonderful review. We’re glad to hear that you found it easy to get started and that the price works for you. We really appreciate you sharing your experience with us – it means a lot to the whole team 😊
Best regards,
Mikkeline
The chat system was really good to…
The chat system was really good to answer my questions. Well done! Rarely that helpful
27 January 2026
Reply from OiSTER
Hej Renaud
Tusind tak for din anmeldelse. Det er virkelig dejligt at høre, at du har haft en god oplevelse med vores chat og har fået hurtige og brugbare svar. Vi sætter stor pris på, at du deler din oplevelse med os.
Hvis du har forslag til, hvad der kunne gøre din oplevelse helt i top, vil vi meget gerne høre fra dig, så vi kan blive endnu bedre.
De bedste hilsner
Mikkeline
Completely unusable from day one – worst decision to switch provider
This has been an extremely frustrating experience from the very first day.
We activated Oister Home Internet (5G) on January 11, 2026, and the service has been completely unusable from day one. Despite following all recommendations, the connection does not work as advertised or promised during the sales process.
We performed multiple speed and stability tests throughout the day. Results fluctuate heavily and, most critically, the upload speed dropped to 0 Mbps in the latest test. With 0 Mbps upload, the connection is effectively broken: no streaming, no work platforms, no online gaming, and even basic browsing fails.
To rule out any user-side issues:
The modem is placed directly at a window, literally against the glass
Devices are in the same room or only one wall away
Still, phones and TV fail to connect or constantly disconnect
At this point, I am forced to use my iPhone’s 5G connection (Norlys) just to send emails and leave this review, because Oister’s home internet does not work at all.
Support and communication are equally disappointing:
There is no functional email contact
It is impossible to call support on a Sunday
The sales representative promised to be a direct contact, but the email address provided does not even accept incoming messages
As a result, we already lost one full day of service and one day of the 14-day withdrawal period, without having a working connection or proper support. This feels deeply unfair.
We were also scheduled to move four mobile phone lines to Oister shortly, but after this experience, we have completely lost confidence.
In short:
The service does not work, does not match what is advertised, and the support structure is inadequate when problems arise. This has been, without exaggeration, the worst decision to switch provider.
11 January 2026
Unprompted review
Reply from OiSTER
Hi Julio
Thank you for your honest review. We completely understand that this has been a very frustrating start, especially when the connection does not live up to your expectations and has affected both your daily life and your trust in us. It sounds like you have experienced significant challenges with both stability and support, and we take your feedback seriously so we can learn from it and improve going forward. You are very welcome to contact us at trustpilot@oister.dk
if you would like to elaborate on your experience – we would very much like to hear from you.
Kind regards,
Mikkeline
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