winSIM Reviews 

For over 3 years I have been using their sim card and to be honest I just choose it due the low cost but would be ideal to have a warning that low cost comes with low QoS in customer and in signal/service performance.

Even when paying an extra amount for the hot-spot feature it cannot be used properly.

SCAM ALERT: Avoid Winsim.

Turned on my phone outside the EU (Montenegro) for 5 seconds and instantly got charged the full €59 legal limit because they bill €12k / GB. (That is not a typo). That's not a phone plan, that's a trap.

They are unethical, greedy, and bad karma.

Go with anyone else, like Fraenk.

Friendly customer service. I find online account easy to use and make changes on. The mobile internet coverage isn´t always the best. But all in all good value for a low price.

I had a very disappointing experience with winSIM. During a phone call, an employee offered me a 50 GB tariff and told me I would effectively pay €9.99 per month because I would receive a €15 credit every month. Based on this information, I agreed to the tariff change.

I later discovered that the credit was only applied once and the actual monthly price was €24.99. My previous tariff was already around €15 for 40 GB, so I would obviously not have agreed to pay €10 more just for 10 GB extra.

I contacted winSIM multiple times asking them to investigate the phone call and the information their employee gave me. Instead of addressing this, they repeatedly sent standard replies about the 14-day cancellation period and completely ignored my request to investigate the call.

Very frustrating experience. My main complaint about the telephone advice still has not been properly addressed.

my experience : My WinSIM account was hacked. I contacted customer service multiple times, providing my original order email, order PDF, and all personal details , yet every single time I was told "we cannot verify your identity." How is that possible when I submitted everything?

I had to involve a German government authority just to get my own account back. thanks to them !!

On top of that, I took a day off work for a scheduled DSL installation appointment. On the day itself — no technician was appeared , just an email saying the appointment had been moved. No apology, no explanation.

Two major failures. Zero accountability. I would not recommend this provider to anyone.

By far the worst mobile provider experience I've ever had. I repeatedly reported poor mobile internet coverage even outdoors in central Berlin, but received no meaningful support and was constantly told the issue was on my side. At one point I stopped receiving SMS messages altogether without any notification from winSIM. I discovered this only by accident. For two days I was unable to receive authentication codes for banking and other important services. Support insisted that nothing was wrong on their end and provided no help while I had to investigate the problem myself. Eventually it became clear that network settings had apparently changed, but there was no communication, no apology and no assistance.

On top of that, cancelling the contract and transferring my number turned into a bureaucratic nightmare with incorrect customer data in their system and constant delays. Inflexible processes, poor communication and almost nonexistent customer support.

I originally chose winSIM because I believed it was the cheapest option available. Perhaps that was true when I signed up around three years ago, but it certainly isn't anymore. I have now switched to another provider, pay even less and have had no connectivity issues at all. My new plan includes fewer GB of data, but I never even used half of my allowance with winSIM.

Last but not least, if you are unhappy with the service during the initial 24-month contract period, there is effectively no flexibility. Leaving early means paying almost the full remaining cost of the contract. Looking back, switching earlier would have saved me a lot of time and frustration.

Without a doubt, this has been the worst mobile provider experience of my life.

Don't ever buy this, worst in Germany and worst in Europe. I called 5 times to service center, no-one listen to your problem and just say send us email, then why you have service number. Worst service than anything.

on 22.02.2026 My Husband made a mistake of writing the Bill numbers, and realized after he paid them. He at once sent an email in WinSim Servicewelt, but they did not correct it. Then they sent another Warning to me for the same bill of 12,49 but not the full amount, but subtracted 4,99 and they requested 7,50. I sent another email explaining the details but they did nothing again. Now BID Bayerische Inkasso Dienst sent us a payment warning. What a stupid service WinSim have!

on 22.02.2026 I made a mistake of writing the Bill numbers, and realized after I paid them. I at once sent an email in WinSim Servicewelt, but they did not correct it. Then they sent another Warning to us for the same bill the subtracted amount but not the full amount, which was 12,49 and they requested 7,50. I sent another email explaining the details and asked them to pay back the extra 7,50 Euro that I paid instead of 4,99 Euro. Where is my 7,50 EURO?

This is the worst company that I have ever dealt with. I am about to sue them for harassment and to pay me back all of my money. They will ignore your termination and send debt collectors after you. Their service doesn't work. I could never receive text messages and eventually calls didn't work either. They have the worst customer service of all time and they will never leave you alone. Absolute nightmare - avoid avoid avoid!

Their customer service doesn't reply.
Additionally they keep charging me even if I already terminated my contract with them.
Seriously, opt for another mobile line provider and avoid winsim.

probably the worst customer service that i ever had. i dont speak fluent german and when i called them, i didnt understand a sentence he mentioned, and he shouted NEIN NEIN NEIN NEIN NEIN (im not exaggerating). the worst ever experience that i had

Connection is terrible. They charged me three times (each time 60€) when I was out of the country, even though I deactivated their card and used a foreign one. Customer service is terrible and all in one: A SCAM! Don't fall for their cheap prices.

DON'T DO IT! You will never get rid of them. This company is not following the law, they are not canceling contracts and their customer service is a nightmare. I reported them to the Bundesnetzagentur and might need to take a lawyer to get this nightmare to stop. Really - don't consider this scam of a company.

Horrible in every possible way. Just away from of this

They don't end you contract until you notice their support despite having terminated it using their website and of course they expect you to pay even tho the mistake is on their side

I would give -1 star if it was possible. 1 is also generous for this company. They don't reply to emails, customer service is soo rude on the line. and they also can't do the right calculations for payment. Its like they hired a people who can't do their job. Would never recommend this company to anyone

The Service was fine at best but unhelpful and misleading. I had previously ended my contract because of some extra costs on my card that I did not approve or was informed of.
Service told me we could possibly recover the number but in the end couldn’t.
I would have preferred an outright “No” before I entered another contract and spend another cent.

Expensive and difficult to cancel. To terminate contracts you have to make a phone call, after you click termination in the service website.

I moved recently and ordered a winSIM DSL 16 connection, but it was registered to the wrong address. When the technician arrived, I found out about the mistake. Attempts to contact customer support failed, and when I filed a complaint, I was told the cancellation period had expired.

I then ordered a DSL 100 connection for the correct address, but no technician showed up on the appointment day, even though I was home waiting. Customer service ignored my calls and complaints.

To make matters worse, I received an email about terminating my telephone connection — which I never requested.

Due to repeated service failures and lack of communication, I decided to terminate all services. I urge others to be cautious and call for consumer protection authorities to look into winSIM’s poor service.