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
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
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
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
Company replied
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
Company replied
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
Written by the company
Written by the company

Fadet 4, 1799, København V, Denmark
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.
I'm very impressed. Leaving the company when I moved away took me literally a few clicks on the web page! Will come back as a customer again.

Reply from OiSTER
I have never experienced Any problems with them. Even when payment is slightly late they send a friendly reminder pr. SMS without making you Pay expensive fee's. Also they send u friendly reminders if you Are close to exceeding your download limits. The price is very affordable too. Customer service is tip top too. Nothing bad to say.

Reply from OiSTER
Go somewhere else!
I've had calls to EU charged, although my subscription very clearly included calls to EU.
First time, customer "service" returned to money, after many increasingly sternly worded emails. Second time they refused in the exact same scenario.
Luckily, the Danish tele market has a lot of operators who are happy to take over cancellations etc.
The Danish "Teleankenævn" is by the way where you go and submit a complaint for charges not in your contract.

Reply from OiSTER
Great mobile company! Never had problems with them.... Always kind and helpful..... I tried some companies before.... Oister it is the best! Good quality of sound, great covering all over Denmark and very cheap..... I pay 89 Dkk for free talking and 40 GB..... Very cheap.... I will never move from OISTER. All my family having Oister and they are super happy. Thank you Oister.

Reply from OiSTER
I appreciate Professional client services, fast and easy to use application, individual approach.

Reply from OiSTER
I ordered sim card online and I didn't get it during 15 days.
this is worst case that you enter new country and order sim card to manage your life and you don't get your order after 15 ongoing days.
Customer service line always Busy 70313070

Reply from OiSTER
Don't make the bad decision to hire Oister!
We have done so and regret it greatly!
The new Oister sim card was supposed to be sent to us and never arrived. We no longer have service with the other phone company and no longer have service with Oister.
When you try to contact customer service and no one answers, the phone number doesn't work, and they respond to emails with DAYS of delay!
Really if you have a problem no one can help you!
Do not hire OISTER! I warn you so you don't have the hard time we are having!

Reply from OiSTER
Unfortunately, I ma part of the 50% of customers that find this company despicable. 1 star is too generous. I agree with the others that the customer service and the waiting time is horrible & you wait 30 minutes to be told that it is Post Nord fault that they have not send you a SIM card. Basically you pay your subscription and do not have a working phone and the only thing they can do is to say sorry, but you still have to pay, even if you do not have a phone???Not to mention that they close at 15:30 on Friday, and rest on Saturdays, when it is a services working day!

Reply from OiSTER
Besides the below average coverage in the middle of the city, you need to know if you have several phones on one subscription (family subscription or whatever its called, I can't check anymore), then its ONLY the person who makes the account who can log in. If you're a spouse to that person, Oister has a new shiny system that makes sure you'll be treated like your spouses child. Not an equal paying costumer. Its one thing to create the account with nem-id, but not making it possible to log in without it, when there's multiple users, is just the most demeaning service.

Reply from OiSTER
Very good service everything working perfectly.
Very good value
As a customer for around 10 years I expected proper service.
I used to be happy with Oister until today!
I requested a number transfer from another carrier to Oister a week ago. According to the emails received from Oister the transfer was about to happen today. So far so good. I received email stating that the QR-code for my esim is ready and I can active it from mitoister but guess what. After logging into mitoister I realised that there is no QR-code at all and I am left without a phone. I tried reaching customer service via email, cued for over an hour on the phone without success. Ridiculous!!!
So far I’m left without a phone for 24 hours and counting!!!
What are you going to do about it? Simple sorry isn’t acceptable at all!

Reply from OiSTER
I have talking with one young lady and she was very fast rude without having experience talking about buying one phone ,and very easy she told me * go check in costumer shop* that all,,i am very sorry but like that ,, easy to lost your costumers
The absolute worst experience I have ever had with a phone service provider.
Constant extra costs, long waiting times, incompetent staff who do not help you have waiting 40 mionutes on the line. Bad connection. Do not go for this provider.

Reply from OiSTER
Super god net til at snakke i mobil men net der skal skal deles er ikke altid helt ok
I have TRIED to pay them the montly fees 3 times.
But they have a problem receiving money - as they now state on their website.
BUT... they then shut down my services!?
I have 2 phone numbers and a router through them - and they turn off my services because THEY can't receive money!?!?
At least leave my services open until you figure out things on your side!?!?
Unhappy!
Patrick Drew

Reply from OiSTER
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.