Reasonably priced services. Socially responsible company. Runs on Orange network, which works best where I live, at the time of this post (could be different elsewhere). Reached out for support when... See more
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See what reviewers are saying
We transfered the number of my wife to UNDO. We thought of going to Hey because of the better price (with Hey S) but we really appreciate that everything with UNDO is smooth and whenever we needed the... See more
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Quite a stressful 2 hours wait when my old sim card got disconnected from the network and the new Undo sim card got activated. I should say that a switch around noon on a Wednesday is perhaps not a go... See more
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Our experience as a SME/PME/KMO : When switching over mobile, there was a strange problem with the first transfer, so - in order to keep business running - we paused until (the root cause of ) tha... See more
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Company details
Written by the company
UNDO is Belgium’s first climate-neutral mobile operator. We combine affordable mobile plans with real impact: CO₂ compensation, reforestation in Congo and Belgium, and Zero Waste on all our subscriptions. With us, unused data, minutes and texts don’t disappear — they roll over to the next month. No waste, no fine print — just honest mobile. Starting from €4/month.
Be a bit more sustainable with UNDO
Written by the company
- Measure your impact, and reduce it!
- The UNDO app measures your carbon footprint from using your smartphone in real-time. Users can see the sources of the emissions and also take steps reduce it! Conscious consumption is sustainable consumption. What you cant reduce can be compensated by supporting carbon removal technologies that ensure removal and long term storage through UNDO Removal in the mobile application.
Contact info
Chaussée de La Hulpe 177/11, 1170, Brussels, Belgium
- +32490461999
- support@undo.be
- undo.be
Join UNDO, make the planet better!
4.2
Great
496 reviews
Replied to 100% of negative reviews
Typically replies within 1 week
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See how their reviews and ratings are sourced, scored, and moderated.
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us!
The UNDO team
Reply from UNDO
Hi,
Thank you for your review! We appreciate your feedback and strive to continuously improve our service. Could you contact us on support@undo.be? We will resolve your issue then.
Kind regards,
The UNDO Team
Adding 5€ without a previous notice…
Adding 5€ without a previous notice that my payment didn't pass and I need to fix it in certain period of time. And if I don't fix the payment in that period it can be added, but added directly is nonsense. I will start looking for a better alternative
September 26, 2024
Reply from UNDO
Thanks for your sharing your review.
UNDO always sends out all invoices on your 'registered' email id. UNDO also sends regular reminders via email if your invoice is not paid to the 'registered email id'. Invoice payment is also available in the mobile application. On top of this we give at multiple weeks for you to clear your payment.
In your case this was not done and so you were charged the extra amount. If you are facing issues with making payments then please send us an email at support@undo.be. Describe your issue in detail. Provide proof that you tried to pay and the payment failed. We will verify your claim and check why the payment of your invoice did not go through, and based on our finding we shall see if the extra fees can be waived off.
Regards,
Team UNDO
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us!
The UNDO team
Great service, great impact, great price
Great service, great proposition. I love how it’s affordable and focuses on being climate friendly.
September 26, 2024
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us!
The UNDO team
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us!
The UNDO team
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us!
The UNDO team
4G network is erratic on Luxembourg border with France and Belgium
Most of the time it works alright but I get multiple service interruptions daily when crossing borders to the point that my phone can’t load Waze directions for minutes.
October 2, 2024
Reply from UNDO
Thanks for your review. Service interruptions are common for all mobile networks and more so around bordering regions! Moreover, UNDO uses the Orange network which is a major network in your region and have not faced this complaint, and has very little control on this. However we value your input and will try to work together with our host operator to improve the situation.
Kind regards,
Team UNDO
The premise was great but failed
The premise was great. Plant a tree on my behalf just for using their service. When I first signed up, I didn't get any service for over a week. Then when I contacted them to ask why, they said they needed a copy of my ID first.. Why didn't they say so when I signed up?? If I never contacted them, I never wouldve had any service and they still would've charged me. At first, the service was great. Then after a few weeks I noticed I wasn't able to send any pictures, so I contacted them again and was advised that mms is a separate add on that I need to pay for.. What is this? The stone ages? Of course I wasn't going to do that, might as well just use WhatsApp. Meaning, I barely even use this service, so really just pay 'just in case someone I don't know tries to call me'. What a waste of money honestly. Their website is horrible! It never works! I don't even get any emails about my invoices. When I contacted them about that, they just forwarded me the past invoices. But I'm still not getting any new ones, so they didn't even fix that issue. This was the last drop. I'm going to cancel my service unfortunately.
April 16, 2024
Reply from UNDO
Thanks for your detailed review. It helps us improve UNDO!
We regret the experience you have had with us. Indeed we had issues at the start but those have all been addressed now. We are also improving our onboarding for new clients. As for sending pictures most users use 'Whatsapp' and other media such as 'Telegram' which help you send images free of cost using just your internet connection.
We have also upgraded the website now. We can confirm that all your invoices are mailed to your 'registered email id'. Moreover, we have also improved the invoice payment feature and you can directly pay your invoice via our mobile application or the self care portal.
In case you still cant find your invoices please send us an email to support@undo.be, with your UNDO mobile number. We will resolve this issue right away! Lastly, as a gesture of respect for your support and patience we would more than happy to offer you some compensation to still have you as a part of the Undo family.
Kind regards,
UNDO Team
Good company
Really good internet, great software, and affordable price. I just want you to offer new deals, for example 80 GB, 100 GB, good, at a cheap price, so you can compete with the other big companies.
November 1, 2023
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
Happy using UNDO services
Reasonably priced services. Socially responsible company. Runs on Orange network, which works best where I live, at the time of this post (could be different elsewhere).
Reached out for support when undo.be website was down and I could not manage my subscription, response was not instant, but they came back and resolved issues within 1 day, which I find perfectly acceptable.
Good services overall.
September 25, 2024
Unprompted review
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO-team
I could not and cannot find how to…
I could not and cannot find how to upgrade (immediately) when 100% of my usage was reached.
August 27, 2024
Reply from UNDO
Hey, thanks for your question. We are here to help you out.
You can add more data to your subscription by activating the 'Data Add-On'. You can do this via the self help portal(www.wsc.undo.be), or, via the UNDO application on your smartphone. Follow the below steps in order to find and activate the Add-On:
1. Log into your account via the application or self help portal
2. After login look for the 'Show Me' button at the home screen and tap on it.
3. here you will find the telecom as well as other value added services from UNDO.
Hope this helps, and if it does could you revise your review to a better rating.
Thanks and kind regards,
Team UNDO
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
Good experience on the whole
Good experience on the whole, but the cost for a physical SIM card is high (10 EUR). And no help desk, only the FAQ to save you...
July 10, 2024
Reply from UNDO
Hi,
Thanks for the review. We understand that the cost for the physical SIM is high but its not set by us and rather dictated as per the market rates. Addressing your question on the support - you can call our customer care at +32 490 46 19 99, or send an email to support@undo.be.
Thanks and kind regards,
Team UNDO
clear, easy, self-manageable and correct
August 27, 2024
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
Mobile operator neutral Carbon = great
First time in Belgium ! A mobile operator with a great sensibility for the future and for the ecology! The price are very competitive with many data.
I will never change for another one now!
I follow the evolution of the “ibi village” and the plantation of the trees with my compensation on the Undo app! Its amazing All What you can do with Undo !
May 24, 2024
Unprompted review
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
Unreliable & systems do not work
App and website rarely work. Nothing just works the way it's supposed to. Paying invoices is hell, they don't give you any payment info, just a link that goes to the wrong place. Then if you fail to pay because their systems are down, they will lock ur number. No warning, just suddenly no mobile data, calls or texts in the middle of the day. I have been begging them for a link or a bank account to just pay my bill cause their app& site are both not working to pay. But still, even after letting them know, they've locked up my number and now my clients cannot reach me....
Don't join if you need reliable network and services. It's the second month this happens & i've only joined in february.
Honestly too bad I had really high hopes for this company
April 20, 2024
Unprompted review
Vert happy with this mobile operator
Vert happy with this mobile operator. I get the service I need (high volume of data and calling minutes) at a good speed for a fraction of what i was paying with my previous operator
May 21, 2024
Unprompted review
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
The most relevant mobile network in BE
As the only network in Belgium enabling carbon emissions estimation and offset, UNDO is developing to become a reference for it's innovative approach and affordable offer.
Expect good service from a growing business.
May 1, 2024
Unprompted review
Reply from UNDO
Thank you for your positive feedback! We're happy to hear that you're satisfied with our service. If you have any questions, feel free to reach out to us! The UNDO team
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