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 bee... See more
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See what reviewers are saying
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
Company replied
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.
Company replied
Affordable, practical and it just works, even in long term trips in the EU outside DK, my OiSTER account holds strong, great coverage all over. I've been a customer since November 2019. I once switche... 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
28k reviews
Asks customers to review
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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
Slow and disappointing service
I moved to Oister from Telmore hoping for better service. I was told that the sim card would arrive in my letterbox in one or two days. After one entire day, it has not even left their warehouse. In the meantime I have no access to data, call service or my e-wallet. Slow service and not being provided with the correct information. Disappointed with the company.
6 January 2026
Unprompted review
Reply from OiSTER
Hi
Thank you for your feedback and for sharing your experience with us.
We are sorry to hear that your service did not meet your expectations. We understand how frustrating it is to be without data, call service, and access to your e-wallet.
Please note that our warehouse is located in Sweden, and there was a Swedish public holiday on January 6th, which could have contributed to the delay. Typically, SIM cards take 2–5 business days to be delivered. While this may explain part of the delay, we understand that it has caused inconvenience, and we apologize for that.
If you would like, you can contact us at trustpilot@oister.dk
so we can review your order and see if there is anything we can do to assist you further.
Best regards,
Mikkeline
Reply from OiSTER
Hej Niels
Tusind tak for din søde anmeldelse!
Hvor er det dejligt at høre, at du er glad for OiSTER og har haft en god oplevelse med vores kundeservice – det betyder virkelig meget for os. 💜
De bedste hilsner
Oliver
Reply from OiSTER
Hi,
Thank you so much for your review!
We're really glad to hear that you found the process easy – that's exactly what we aim for.
Your feedback means a lot to us. 💜
Best regards
Oliver
Reply from OiSTER
Hi,
Thank you so much for your review!
We're really happy to hear that you found our team member both nice and helpful – feedback like yours means a lot to us and motivates us to keep up the good work.
We hope you continue to have a great experience with us😊
Best regards
Oliver
Reply from OiSTER
Hej Kevin
Tak for din anmeldelse! Vi er glade for, at du har haft en ok oplevelse hos OiSTER 💜 Vi vil altid gerne gøre oplevelsen endnu bedre, så du må meget gerne dele, hvad vi kunne gøre for, at du får en endnu bedre oplevelse fremover.
De bedste hilsner
Mikkeline
Just one small problem
Just one small problem -I had problems paying for the new 'abbonnament' with my DK card - took two days. Everything else seems very good.
2 December 2025
Reply from OiSTER
Hi Gerry
Thank you for your feedback! We’re glad to hear that everything else went smoothly. We understand that payment issues can be frustrating, and we appreciate your patience while it was resolved.
Best regards
Mikkeline 💜
Reply from OiSTER
Hi Danny
Thank you so much for your review. We’re really happy to hear that you’ve had a great experience with our service, and that our mobile data lives up to your expectations. 💜
De bedste hilsner
Mikkeline
I’ve been using my sim card for 1 day
I’ve been using my sim card for 1 day, registered for three. The internet seems fine, but the amount of emails you send is insane.
I’m using your services since morning! I don’t have a review yet, please, leave me alone💀
12 November 2025
Reply from OiSTER
Hi
Thank you for your feedback. We are glad to hear that the internet is working fine for you. 💙
We’re sorry if the number of emails has been overwhelming. You can adjust your email preferences in your account to receive fewer messages. Please let us know if you need any help with this, and we’ll be happy to assist.
Best regards
Mikkeline
Just to let you know that I am…satisfied
Just to let you know that I am satisfied with oyster until now and I hope oyster keep me always as it is.
10 November 2025
Reply from OiSTER
Hi Mohammad
Thank you for your review. We are glad to hear that you are satisfied with Oister so far. We will do our best to ensure that you continue to have a great experience with us.
Best regards💜
Mikkeline
well going back to Oister lets see how…
well going back to Oister lets see how it goes
4 November 2025
Reply from OiSTER
Hej Tommy
Tusind tak for din anmeldelse!
Det er dejligt at høre, at du er tilbage hos Oister, og vi håber, at din oplevelse bliver lige så god som forventet. Skulle du få brug for hjælp undervejs, står vi altid klar til at assistere, så vi kan sikre, at alt går glat. 😇
Vi ser frem til at give dig den bedst mulige oplevelse! 🌊💜
De bedste hilsner
Mikkeline
Very Well english comunicațion and very…
Very Well english comunicațion and very goods offers.
31 October 2025
Reply from OiSTER
Hi Viorel-Marius,
Thank you for a fantastic review.
We’re happy to hear that you’ve experienced great English communication and great offers. We strive to provide excellent service and prices that are accessible to everyone.
Best regards,
Aleksander
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