Jean-Marie R. F.
Posted
Everything did function as adertised.
Everything did function as adertised.

Great
580 reviews
OneSimCard.com provides inexpensive international mobile connectivity for travelers, businesses, and connected devices, helping customers stay connected wherever their journeys or operations take them. A service of Belmont Telecom, Inc., OneSimCard combines telecommunications experience with practical solutions designed to simplify global communications and help customers manage their connectivity costs. We've been helping our customers stay connected for over 30 years.Our services include international eSIMs and physical SIM cards, prepaid mobile data plans, voice and text options, and corporate mobile solutions. Travelers can choose connectivity that fits their destinations, devices, and usage needs, with convenient online account management and recharging. Our OneSim VoIP app provides additional calling and messaging options over an internet connection.For businesses, OneSimCard also offers IoT and M2M connectivity for applications such as asset tracking, fleet management, connected equipment, and remote monitoring. Flexible connectivity options and SIM management tools help organizations support deployments ranging from a handful of devices to larger international operations.Supporting our customers is central to everything we do. We understand that selecting a service is only the beginning: customers also need clear guidance, straightforward setup instructions, and knowledgeable assistance when questions arise. Our team helps customers navigate product choices, activation, account management, and technical troubleshooting, supported by online resources and direct customer support.Whether you are planning an overseas vacation, keeping employees connected abroad, or managing devices across borders, our goal is the same: to make international connectivity easier to understand, simpler to manage, and backed by people committed to helping you succeed.
OneSimCard (onesimcard.com) has 580 customer reviews on Consumer Courier, with an average rating of 4.0 out of 5.
580 approved reviews, newest moderated first
Jean-Marie R. F.
Posted
Everything did function as adertised.
Gabor
Posted
My English is not very good, but Steve was extremely patient and helpful. He explained my problems several times and made sure I understood everything. He helped me solve a problem that I had been struggling with for years. I am very grateful for his excellent customer service. I highly recommend Steve and OneSimCard to everyone!
Response from OneSimCard· Oct 9, 2026
Hello Gabor, Thank you very much for the 5-star review and for your business! We are thrilled to hear about your very positive experience with our Support Team, and they were able to answer all of your questions. We take a lot of pride in our Support, so it is always good to hear how their hard work and training is paying off! You can always reach us in the help section of our site: https://www.onesimcard.com Don't forget about our refer-a-friend program. This program is available to all OneSimCard active account holders. For each friend you refer that purchases new service, you will receive $10 deposited into your 1SIM Money Fund. The referral bonus will be received once the order for new service is placed, shipped and the 30-day return window has closed. You can then use these bonus awards to recharge your airtime or use toward any other purchases. There are no limits to the number of friends you can refer or the bonuses you can receive! In addition, your referred friend will also receive a 5% discount on their initial order, excluding airtime. To refer a friend, simply log in to your account and click the Refer A Friend link on your main account menu. You will be notified when your referrals make a purchase and will be able to track all of your referrals right from this Refer A Friend page. Again, thank you for your positive review and the accolades you gave our Support Team. Safe travels, The OneSimCard Team
customer
Posted
Poor connections. Unstable, unreliable. eSim failed and support couldn't help. Had to purchase a replacement eSim to fix the problem. Pathetic
Response from OneSimCard· Oct 6, 2026
Hello Michael, We are sorry that you had trouble reinstalling your eSIM. We are researching the problem, but it seems that you uninstalled the eSIM and may have reached the limit of reinstalls (3) allowed. If you reach that limit, the eSIM is no longer valid and you would be required to purchase a replacement. OneSimCard
Tajdin M.
Posted
Received prompt courteous, professional, polite and expert services from Steve
Response from OneSimCard· Oct 6, 2026
Hello Tajdin, Thank you very much for the 5-star review and for your business! We are thrilled to hear about your very positive experience with our Support Team, and they were able to answer all of your questions. We take a lot of pride in our Support, so it is always good to hear how their hard work and training is paying off! You can always reach us in the help section of our site: https://www.onesimcard.com Don't forget about our refer-a-friend program. This program is available to all OneSimCard active account holders. For each friend you refer that purchases new service, you will receive $10 deposited into your 1SIM Money Fund. The referral bonus will be received once the order for new service is placed, shipped and the 30-day return window has closed. You can then use these bonus awards to recharge your airtime or use toward any other purchases. There are no limits to the number of friends you can refer or the bonuses you can receive! In addition, your referred friend will also receive a 5% discount on their initial order, excluding airtime. To refer a friend, simply log in to your account and click the Refer A Friend link on your main account menu. You will be notified when your referrals make a purchase and will be able to track all of your referrals right from this Refer A Friend page. Again, thank you for your positive review and the accolades you gave our Support Team. Safe travels, The OneSimCard Team
customer
Posted
Brian was so helpful. He explained well and I was able to get what I needed. Great job!
Response from OneSimCard· Sep 30, 2026
Thank you very much for the 5-star review and for your business! We are thrilled to hear about your very positive experience with our Support Team, and they were able to answer all of your questions. We take a lot of pride in our Support, so it is always good to hear how their hard work and training is paying off! You can always reach us in the help section of our site: https://www.onesimcard.com Don't forget about our refer-a-friend program. This program is available to all OneSimCard active account holders. For each friend you refer that purchases new service, you will receive $10 deposited into your 1SIM Money Fund. The referral bonus will be received once the order for new service is placed, shipped and the 30-day return window has closed. You can then use these bonus awards to recharge your airtime or use toward any other purchases. There are no limits to the number of friends you can refer or the bonuses you can receive! In addition, your referred friend will also receive a 5% discount on their initial order, excluding airtime. To refer a friend, simply log in to your account and click the Refer A Friend link on your main account menu. You will be notified when your referrals make a purchase and will be able to track all of your referrals right from this Refer A Friend page. Again, thank you for your positive review and the accolades you gave our Support Team. Safe travels, The OneSimCard Team
M. M.
Posted
I'm updating my review after my experience yesterday. I noticed that my data was almost used up, so I went to purchase a new data plan. Unfortunately, OneSIM doesn't allow you to buy a new data plan until the old one's used up. So I deliberately used up my data, checking how much I had remaining every few minutes. When I received an SMS that my plan had been used up, I immediately put my phone in flight mode. I then purchased a new data plan. But right before doing that, I noticed my balance was $4 lower than it was earlier that day. So I went on OneSIM's chat support and explained what had just happened. The guy agreed this lower balance was due to the lapse in between when my data plan was used up and when I received an SMS about it. And he did not give a flying flip. He said it was _my_ responsibility. I'm not sure how something that wasn't humanly possible was somehow my responsibility. It's particularly deceptive considering that OneSIM is always encouraging customers to buy a plan in order to avoid exorbitant charges for data. The first piece of spaghetti he threw at the wall was to suggest that I sign up for automatically renewing data plans. Well, that's exactly what I used to do, and OneSIM makes it clear that the same thing can happen with automatically renewing data plans. Next, he took this as an opportunity to upsell me to the DataMax SIM card. At my expense, of course. After his prior suggestion, I had no reason to trust a word he said. Unfortunately, I don't know of any other SIM card service providers for international travel that are a better option.
John G.
Posted
Great help and support but the website is flaky and often unavailable, and I do not know why. I cannot log into my account yet again, Cloudflare reports a host timeout or in one case when I did get the account login page and SSL handshake failure. These should not be problems, and they need to fix their web hosting
Response from OneSimCard· Jun 1, 2026
Hello John, Thank you for a great review and your candid feedback. We are very proud of our Support Team and we appreciate it when their hard work is recognized. We are aware of the problems with the website today and working with our hosting service to correct it. We know and appreciate how frustrating these timeouts can be when you are just trying to login to your account. This is under investigation with the hosting service and we hope to have it resolved quickly. Thanks again for the review we really appreciate it! Safe travels, The OneSimCard Team
Steve R.
Posted
Needed help in setting up my account for SIM and extra-number payments. Gino R was great! Helped me thru multiples steps in the process. Appreciate your "live person" help.
Response from OneSimCard· Apr 17, 2026
Hi Steve, Thank you very much for the 5-star review and for your business! We are thrilled to hear about your very positive experience with our Support Team, and they were able to help you set up your account. We take a lot of pride in our Support, so it is always good to hear how their hard work and training is paying off, and Gino is definitely a rock-star! Don't forget about our refer-a-friend program. This program is available to all OneSimCard active account holders. For each friend you refer that purchases new service, you will receive $10 deposited into your 1SIM Money Fund. The referral bonus will be received once the order for new service is placed, shipped and the 30-day return window has closed. You can then use these bonus awards to recharge your airtime or use toward any other purchases. There are no limits to the number of friends you can refer or the bonuses you can receive! In addition, your referred friend will also receive a 5% discount on their initial order, excluding airtime. To refer a friend, simply log in to your account and click the Refer A Friend link on your main account menu. You will be notified when your referrals make a purchase and will be able to track all of your referrals right from this Refer A Friend page. Again, thank you for your positive review and the accolades you gave our Support Team. Safe travels, The OneSimCard Team