Yesim Reviews 

Company quickly addressing problems in a positive way and hoping to use them more in future
Previously poor communication absent. No explanation of what top up requirement is or how to effect a data top up. App not user friendly or clear.
Probably the last time I will use this

Great support and easy setup, works like a charm!

Cheap, easy, works great

Waste of time in Turkey!
Had 2 sims one managed to use less than 1GB in a week one of them. Never able to connect very unreliable. When you contact them they try to help but all they can do is continually ask you to go through settings over and over and over again. After doing this a dozen times or more you tend to give up the will to live, and the only way you can contact them is if you are lucky enough to get on WiFi at hotel.
They somehow say on the other sim I used almost 5Gb in 3-4 days yet most of this time I was on hotel WiFi.
Should have known they wouldn’t be great as previously my wife used them in Turkey and they were poor then.
Don’t get tempted by their lower price for Turkey as you’ll get little or no connection.

Scam and misleading claims.
Bought a 'unlimited' 29 days plan to use in Turkey.
First, why 29 days?!? A month is 30 or 31!

Then, "unlimited" is maybe in theory true but in practice it is a lie given the speed limitations you get.
In my case after 4 days of use the speed was basically throwing me off !!

Extract from their plan details (which you can only access once you bought the plan...) : "How does FUP affects Yesim Unlimited Data Plans
Note: If you exceed the data-usage limits of your Unlimited Data Plan, the operator might reduce the network speed.

With Yesim’s unlimited data plans, you won’t face overage charges, even if a provider’s FUP kicks in. However, if you exceed the high-speed data allotment set by a partner network, you might notice slower speeds until your daily or monthly cycle resets. "

Note the oxymoron in "Note: If you exceed the data-usage limits of your Unlimited Data Plan".
At this point they're just insulting our intelligence.

Use another provider if you can or find a way to get access to a local plan if you travel ...

Yesim replied to me to complain about my experience(sic!) and tell me to contact their team ... for what exactly ? To speed-up my connection ? Then why is it slowed-down in the first place?
And if 'restrictions are determined by the local operator, not by Yesim', then what good are you ?! What service are you selling exactly? An unlimited shitty speed connection ?! Well you can keep it, I advise all to avoid you an try something else !!!

Super Service. I had a problem with the SIM and the support was amazing good

I bought unlimited for sweden but I didn't get unlimited. After about 55 GB of mobile data they limited me to very slow internet.

Honestly it saved me as I was in a trip to Albania. Thank you for your services

Good customer service and easy to install for peace of mind when using your esim :)

I’m changing my previous positive review. After I recommended Yesim and people registered using my promo/QR code, the company suddenly disabled unlimited plans specifically for my account. Support claims these plans are unavailable in my country, which is simply not true — my friends in the same country still have and use them, and I provided screenshots proving it. Support ignores the evidence and gives misleading answers. Terrible customer support and extremely disappointing service. I no longer recommend Yesim to anyone.

I bought an eSIM for Greece for my iPhone 16. The eSIM from Yesim wouldn't work. I contacted customer service but didn't get a helpful response. I then ordered from another provider, and it worked immediately. It was a really unfortunate experience that caused practical problems during my trip to Greece. So, Yesim doesn't work for everyone or in every country.

something is very, very weird with this company. First off their app is "not available for my country". I am in the Netherlands; app should be available. Next off on the website the "contact 24/7" link in the footer does exactly nothing. All other links work perfectly. For a "swiss" company, this is very very weird.
added: even the link for customer service on trustpilot jumps straight into "page does not exist"

I used Yesim eSim 4 days in Bangkok & 8 days in Phuket, had no problems connecting & stayed connected online throughout my whole trip, am very satisfied with this company's product, would use them again, thank you.

scam, whatsapp doesnt work

Very disappointing experience. The "unlimited" plan is not actually unlimited, and once you hit their cap the internet becomes so slow it's virtually unusable. They suggested upgrading to a paid plan, but somehow we supposedly used 30GB in just a day and a half, despite only using around 40GB over the previous 10+ days on the unlimited plan. We were then told to buy more data. Their AI support bot is frustrating and unhelpful, and by the time a real person responded, we'd already left the country, so there was nothing they could do. Overall, a complete waste of money. I would not recommend this company and would never use them again.

DO NOT BUY Used in egypt for 5 days wish I hadn't total waste of money !
HOPE THIS HELPS SOMEONE .

AVOID AT ALL COST!
Tried using their services in Cyprus. Maximum data transfer speeds you will get is 5 mbps on midnight. During the day it often switches to Edge. Yes Edge in 2026. Forget about 4G not to mention 5G.
If you happen to choose entering a contact support void, they will ask you to take screenshots of your phones settings. After that they will ask you to toggle options off and on. Last thing they will put the blame on their “local partners”. They obviously have shared data rate limits within framework of their “local partners” or similar cheapest possible deal.

I love yesim out of all esims out there this is amazing bc you can literally use it ANYWHERE for so cheap and unlimited data!