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
Company replied
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See what reviewers are saying
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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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
Waiting for my eSIM already abt 5 days
21 July 2025
Reply from OiSTER
Hi Sanjeev
Thank you for your review.
When you request a number transfer, there is a waiting period before your number is moved over to us. The exact timing depends on whether you selected an immediate transfer or a standard one. Your simcard will only become active once the number has been successfully transferred.
If you'd like us to check the status of your order and make sure everything is going as expected, please don’t hesitate to reach out to 70 31 30 70 or at Trustpilot@oister.dk
Best regards Anne
They keep on charging more money and…
They keep on charging more money and they are unreachable
23 July 2025
Unprompted review
Reply from OiSTER
Hi Chantal
We’re sorry to hear about your experience – that’s certainly not how it should be. We’d very much like to look into this for you and clarify what has happened.
Please reach out to us directly at our Trustpilot email: trustpilot@oister.dk – remember to include your phone number or customer ID, so we can locate your account and help you as quickly as possible.
Thank you for bringing this to our attention.
Best regards
Camilla
Reply from OiSTER
Hi Anna
Thank you for your review! We’re happy to hear everything went smoothly and that you had a good experience getting your number set up.
Welcome to OiSTER!
Best Regards
Camilla
Reply from OiSTER
Hi Aiman
Thank you so much for your kind words! We truly appreciate your support and encouragement – it means a lot to us. We’ll keep working hard to live up to your expectations.
Best regards
Camilla
Affordable subscription to all kinds of…
Affordable subscription to all kinds of customers.
9 July 2025
Reply from OiSTER
Hi Marina
Thank you so much for your review!
We truly appreciate your feedback and are happy to have you with us!
Best regards
Anne 🌊🦀
Reply from OiSTER
Hi Thomas
Thank you so much for your kind words! 😊
We’re thrilled to hear that you’ve had a great experience with our service and website. Your support means a lot to us!
Thanks for being part of the OiSTER community.
Best regards
Camilla
The user experience was excellent
The user experience was excellent; obtaining a mobile number was simple and straightforward.
11 June 2025
Reply from OiSTER
Hi Pedro
Thank you so much for your review!
We’re thrilled to hear that you found the user experience excellent and the process of obtaining a mobile number simple and straightforward. Making things easy and smooth for our customers is exactly what we aim for. We're happy to have you with us!
Best regards
Anne
Meget nem at handle med OiSTER.
9 June 2025
Reply from OiSTER
Hej
Tak for din anmeldelse! Vi er glade for, at du oplever det som nemt at handle med OiSTER – det er præcis, hvad vi stræber efter.
En bølge af taknemmelighed – hilsner fra Camilla🌊🦀
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