I placed an order for 4 products, but only 1 arrived in the package. To make matters worse, OiSTER is demanding full payment for all 4 items! I contacted their customer support to get this sorted... See more
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See what reviewers are saying
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 received a call and was internet for home from Oister. Prices were looking good and we agreed that start date will be 1st of August when binding period with my current internet provider ends. They... 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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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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The chat system was really good to…
The chat system was really good to answer my questions. Well done! Rarely that helpful
January 27, 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.
January 11, 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.
January 6, 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.
December 2, 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💀
November 12, 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.
November 10, 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
November 4, 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.
October 31, 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
Reply from OiSTER
Hej Jerry
Tak for din anmeldelse!
Vi er glade for at høre, at du har oplevet god service hos OiSTER.
Det betyder meget for os – tak fordi du tog dig tid til at dele din oplevelse.
En bølge af taknemmelighed – hilsner fra Camilla🌊🦀
After comparing several mobile data…
After comparing several mobile data providers, I repeatedly came to the conclusion that OiSTER offered the best value. At the time of signing up, they also had a very good offer with excellent conditions. They assured me I could change the plan whenever I wanted. Signing up for the eSIM was very easy; I was able to choose a phone number I liked. You have to wait up to half an hour from the time you sign up until you receive the email to activate the eSIM. Since I activated it, everything has been fine. I've used the data and made calls, and I have no complaints. There's only one thing I'm still unclear about: the terms and conditions for calling abroad. I'll have to contact them to ask.
October 11, 2025
Reply from OiSTER
Hi Marta,
Thank you so much for your detailed review – we’re really happy to hear that signing up with OiSTER was smooth and that everything is working well so far! 😊
It’s great that you found our offer valuable and that the eSIM setup went easily. Regarding your question about calling abroad, feel free to reach out to us when you're ready – we’ll be happy to clarify the terms for you.
Best regards,
Camilla
delivery issues
1.5 weeks of waiting and nothing in the mail bag.
The address is correct, the full name is on the mail box
September 30, 2025
Reply from OiSTER
Hi Nataliia,
We’re sorry to hear you haven’t received your delivery yet. If everything is correct with the address and name, please feel free to contact us directly at trustpilot@oister.dk so we can look into it and help you further.
Best regards,
Camilla
Update your Customer Journey Map and inform logistics about it
I switched to Oister in September and started my subscription in October after being convinced by street sales representatives that I can save money on my phone and internet subscription. Sometime in September, within days of switching, I received a delivery, a box containing the internet receiver and, I assumed, SIM cards for my phone and internet. Not having the need for them, I did not open the box until the day came when I had to switch SIM cards. As my subscription to Norlys was still going until mid-October, I asked Oister if it is possible to postpone starting my internet subscription so that I don't pay two subscrptions for nothing. I was informed that it is possible if I don't activate my internet SIM card; that was great news, I can actually save money. The day when I have to start using the new Oister SIM card for my phone came, I open the box, put in the SIM card into my phone and head off to work. When I needed to call, I realized the SIM card cannot connect to the network. I try to find how to activate it, but could not figure out. Interestingly, I had internet but no network connection. I go onto the Oister website, where their chatbot recommends I call Oister. I try to call Oister, but have no network connection. I really needed to call someone, so in the end I managed to call through Whatsapp using my intenet connection. A day or two passed, sending emails to Oister asking where I activate my SIM card, them telling me I don't have to, when I think to myself to check my postbox as well, maybe they sent the SIM card in a letter. Indeed, the SIM card for the phone was in my mailbox, delivered separately from the internet receiver and its SIM card. I ask whether I can have my internet subscription reverted to zero so I pay from mid-October as I inteded, but I am told that it is not possible. Due to Oister sending the SIM cards in two different deliveries and not even mentioning which SIM card is for which I lost around 150kr from the start of my subscription. That is about 3-4 months' savings from switching to Oister. I feel like I should get my 150kr. back just for taking the time to write this post so you can update your Cutomer Journey Map and optimize your logistics so that other customers will have a much better onboarding experience. This will probably not happen, Oister will say they regret this occurence, and...that's that. This really is not the start I was hoping for.
October 6, 2025
Unprompted review
Reply from OiSTER
Hi Daniel,
Thank you for your feedback, and we’re truly sorry for the confusion you experienced during your onboarding with OiSTER.
To clarify: we always send the SIM card for your mobile phone separately by post, while the SIM card for your internet subscription is included in the box with the router hardware. We're sorry this wasn't clearly communicated, and we understand how this may have caused unnecessary frustration.
We appreciate you taking the time to share your experience—it helps us improve. Your comments have been shared with the relevant teams to ensure our customer journey and logistics are better aligned going forward.
Thank you again for taking the time to write to us. We’re genuinely sorry for the trouble this caused and appreciate your patience.
Best regards,
Camilla
Reply from OiSTER
Hi Omar,
Thank you for your feedback. We're sorry to hear that you haven't received your QR code for the eSIM yet — that’s definitely not the experience we want you to have.
Please don’t hesitate to reach out to our customer service team so we can help you get set up as quickly as possible. We’re here to assist!
You can contact us here: 70 31 30 70.
Best regards,
Camilla
Very professional and happy customer…
Very professional and happy customer service person , thank you William H.
October 3, 2025
Reply from OiSTER
Hi Nive,
Thank you so much for your kind words! We're thrilled to hear that you had a great experience with our customer service — and we'll be sure to pass your thanks on to William H.
Best regards,
Camilla
so far so good
October 1, 2025
Reply from OiSTER
Hi Andrews,
Thank you so much for your review! We're happy to hear that everything has gone smoothly so far.
If there's anything else we can help with, don't hesitate to reach out.
Best regards,
Camilla
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