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
Company replied
While we don't verify specific claims because reviewers' opinions are their own, we may label reviews as "Verified" when we can confirm a business interaction took place. Read more
To protect platform integrity, every review on our platform—verified or not—is screened by our 24/7 automated software. This technology is designed to identify and remove content that breaches our guidelines, including reviews that are not based on a genuine experience. We recognise we may not catch everything, and you can flag anything you think we may have missed. Read more
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
Company replied
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
This company invites their customers to review, whether positive or negative
At Trustpilot, it's all about human content. This business can also access our AI-assisted response tool which helps them draft replies.
How this company uses Trustpilot
See how their reviews and ratings are sourced, scored, and moderated.
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.
11 October 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
30 September 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.
6 October 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.
3 October 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
1 October 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
Reply from OiSTER
Hej William
Tak for din anmeldelse! Vi er glade for, at du oplever processen som quick og easy – og at vores personale gør en forskel med venlig og direkte service.
Hos OiSTER går vi ind for 'no BS', så det er skønt at høre, at det mærkes!
En bølge af god energi fra Camilla🌊💜
Poor product
The E-sim hasn't worked (error in the QR code) despite it getting activate by the team and being refreshed / reordered more than 6 times! And the actual physical SIM card hasn't arrived within the promised time.
15 September 2025
Reply from OiSTER
Hi Elisabeth,
Thank you for your review – and we're truly sorry for the inconvenience you've experienced.
It’s frustrating when things don’t work as expected, especially after multiple attempts. We sincerely apologize for the issues with your eSIM and the delay in receiving your physical SIMcard. This is not the experience we aim to deliver.
Please don’t hesitate to contact our customer service team at 70 31 30 70, so we can look into your case and help resolve it as quickly as possible.
Best regards
Camilla
Main page not loading
Main page not loading, can't make actions, always have to reload the page - and even then, it's not guaranteed that works at all -, can't activate eSIM and not giving any explanation, why.
23 September 2025
Reply from OiSTER
Hi Julia,
Thank you for your review. We’re sorry to hear about the challenges you’re experiencing with loading the page and activating your eSIM. That’s definitely not the experience we want for our customers.
We’d really like to help you get this resolved, so we encourage you to reach out to our customer service team on 70 31 30 70, so we can look into the issue in detail and find a solution together.
Best regards
Camilla
Oister has good deals, for new customers
I have always liked oister, I'd been with them for a long time, however I saw a lot of significant discounts coming to new customers and nothing to us long time customers, so I switched until I saw a new deal for new customers that had what I wanted.
12 September 2025
Reply from OiSTER
Hi Derek
Thank you for taking the time to share your experience – and for choosing to return to OiSTER! We’re glad you found a new plan that suits your needs, and we appreciate your feedback a lot!
Best regards
Anne
I bought 1000 mbit internet
I bought 1000 mbit internet. You gave 10mbit. Done.
1 July 2025
Unprompted review
Reply from OiSTER
Hi Casper
Thank you for your review.
We are sorry to hear about your experience. At OiSTER, we offer mobile broadband and OiSTER WIFI, both of which use the mobile network. This means that, unfortunately, we cannot guarantee a specific speed, as it depends on several factors – including coverage, network congestion, and the placement of the router.
We would like to take a look at your coverage and see if there is anything we can do to improve your experience. You are very welcome to send us an email at Trustpilot@oister.dk
with your details so that we can take a look at it.
Best regards
Anne
The girl on the girl helped me to go…
The girl on the girl helped me to go through the process to transfer the network
1 September 2025
Reply from OiSTER
Hi Pema
Thank you so much for your review!
We're really happy to hear that our colleague was able to help you. We appriciate your feedback a lot!
Best regards
Anne
Good explanations
1 September 2025
Reply from OiSTER
Hi John
Thank you for your review!
We’re really happy to hear that you found our explanations helpful. Clear communication is something we care deeply about, so it’s great to know you had this experience.
Best regards
Anne
I've been very happy for over a year…
I've been very happy for over a year now, so I'm getting an additional subscription.
However, there's something they need to fix - their bonus app doesn't count my bills and I'm not accumulating bonus points.
18 August 2025
Reply from OiSTER
Hi Borislav
Thank you for your review and for being with us for more than a year – it means a lot that you’ve even chosen to add another subscription. We’re really glad to hear that you’re happy with Oister overall.
Regarding the issue with the bonus app not registering your bills, that’s of course not how it should be. If you reach out to our customer service team, they’ll be able to take a closer look.
Best regards
Camilla
Costumer service very supportive until…
Costumer service very supportive until now Line she is doing great job and she always seems very responsive to the customer needs.
14 August 2025
Reply from OiSTER
Hi Mateos
Thank you so much for your review and kind words!
We’re thrilled to hear that you’ve had a supportive experience with our customer service – and we truly appreciate your special mention of our colleague. She’s a valued part of our team, and it’s wonderful to know she’s made a positive impression by being responsive and attentive to your needs.
Best regards Anne
Reply from OiSTER
Hi Gabriel,
Thank you for your feedback. We’re pleased to hear that you find OiSTER an affordable and suitable choice for students. It’s always our goal to provide reliable service at competitive prices.
Best regards
Camilla
Reply from OiSTER
Hi Raju,
Thank you for your review. We’re happy to hear that you have had a very good service experience with us, and we hope to keep delivering that level of quality in the future.
Best regards,
Camilla🌊💜
I have tried emailing and calling with…
I have tried emailing and calling with no luck. They say they will reply within two business days but it is not true. I am unable to access my account and am at a loss.
7 August 2025
Unprompted review
Reply from OiSTER
Hi Leonna
Thank you for your feedback — we’re really sorry to hear about the trouble you've had reaching us and accessing your account.
We understand how frustrating this must be, and we want to help resolve it as quickly as possible. Please contact us via Trustpilot@oister.dk and we’ll do our best to get it sorted for you.
Best regards Anne
God intuitivt side med klare…
God intuitivt side med klare instruktioner og god kommunikation
31 July 2025
Reply from OiSTER
Kære Jens
Tusind tak for din anmeldelse!
Vi er glade for, at du oplever vores hjemmeside som intuitiv og nem at bruge – og at instruktionerne og kommunikationen lever op til dine forventninger. Det er vigtigt for os, at det hele føles enkelt og klart.
OiSTER sender de bedste bølger din vej – hilsner fra Anne🌊🐚
Nice presentation
I talked with your sales man named Magnus, he is explained everything clearly and freindly, I'm very happy with the experience.
Tahnk you
23 July 2025
Reply from OiSTER
Hi Mojtaba
Thank you for your review! We're happy to hear that Magnus provided a clear and friendly explanation. Great service starts with good communication – and we’re glad you had a positive experience 😊
Best regards
Camilla
The Trustpilot Experience
Anyone can write a Trustpilot review. People who write reviews have ownership to edit or delete them at any time, and they’ll be displayed as long as an account is active.
Companies can ask for reviews via automatic invitations. Labeled Verified, they’re about genuine experiences.
Learn more about other kinds of reviews.
We use dedicated people and clever technology to safeguard our platform. Find out how we combat fake reviews.
Learn about Trustpilot’s review process.
Here are 8 tips for writing great reviews.
Verification can help ensure real people are writing the reviews you read on Trustpilot.
Offering incentives for reviews or asking for them selectively can bias the TrustScore, which goes against our guidelines.