Onesim Avis 

Excellent service at a great price. Kept me connected in London and again in Ireland at a fraction of the cost of my US network.

Good network coverage, but inaccurate data counter. Purchased two esims from Onesim of 10GB and they both stopped at 9.3GB. Not good.

The purchase was easy, E-sim worked properly in both my trip destinations. Can't complain. Definitely recommend it!

Easy to setup and worked better than the other sim cared that we tried.

Easy to purchase, good speed in the visited countries (Italy, Spain, Switzerland)

everything went smoothly, had internet in france and italy. full 5G speed. But i went to monaco and there it was not working. With my other carrier i had internet in monaco which should be included in france package. would definitly buy it again!

QR code failed to arrive to mail or junk. Follow up email got response a day later with replacement code. SIM worked fine, but connection was poor. It was data only.
However, it was certainly better than nothing! So, thank you.

Fast and efficient
Would be great to monitor the use of data.

Working but really poor service,

2 advice if you buy on this website, don't leave payment page or go back on it with your history if you not receive emails,
And if internet is not working check the APN settings yourself.

I buy esim for Vietnam so first I never received any email, to find the QR code I had to go back to payment url and refresh it to finally get it but not any email,
After this when I arrived Vietnam esim is not working, no internet, so I look how the APN settings are done but nothing is correct I have to use airport wifi and find it online to do all settings myself, but for someone who doesn't work in telecommunications it would be very difficult.

Really complicated for such a service !

Never got my sim in my email
Try to contact support and never got an answer
Felt like a scam.

He did not work with me in Saudi Arabia, it was a bad experience

Buy searsh in Google

Works great!!!!!!!!!!

Good: purchase and installation of eSIM was easy. Convenient pricing.

Unsatisfactory: Ramdomly data rate was dropping to allmost zero (sometimes for hours, sometimes minutes).

Couldn't get esim to work in Vietnam, desperately bought another one from Onesim - same issue, wouldn't register on network. Bought another from a different provider and it worked straight away. 2x money wasted, happy to provide details of other provider if anyone wants it

If I could give a zero rating, I would. I have no idea what went wrong, but you charged me for an eSIM you never delivered (refund email sent for order 18807). I sent an email for help on 31 Mar that was never answered. Customer experience doesn’t get much worse than that unless you burn my house down.

Couldn’t even install card as QR code issued was invalid.