Excellent mobile data coverage across multiple south asian countries. Seamless mobile data transfer while crossing borders. I had taken 2 packages, a 7 days and a 1 day to cover my 8 days stay. On com... See more
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Review summary
Created with AI, based on recent reviews
What people talk about most
Reviews shaping this summary
I had difficulty in installing/activating the eSIM (I am not so good at these things) and an employee replied to me immediately. I send screenshots and noticed that the reply was not automatic. Someon... See more
I had a problem connecting my eSIM abroad so contacted customers services for advice. I’m not the most ‘tech-savvy’ person in the world but my problem was handled with great patience and in an underst... See more
Customer service responded VERY quickly (much quicker than I thought) and was able to resolve the problem that I had to my utmost satisfaction. I've used other eSIM providers in the past, found By... See more
Company details
About ByteSIM
Written by the company
Stay connected worldwide with ByteSIM’s international travel eSIM. Say goodbye to expensive roaming charges and enjoy seamless mobile data wherever you go. Fast, Reliable, and Truly Unlimited – 5G High-Speed, our unlimited data plans provide top-tier network coverage in 200+ countries, including Japan, USA, Vietnam, Malaysia, Thailand, South Korea, India, China, and Indonesia. Get your eSIM today and stay connected hassle-free!
Features:
- Affordable Pricing: ByteSIM offers cost-effective eSIM plans for tourists and business travelers, serving millions of users worldwide.
- Reliable Network: As a licensed telecom operator, ByteSIM delivers fast, stable, and secure 5G connectivity in 200+ countries.
- Flexible Plans: Choose from daily data (300MB/day), high-volume options (50GB), or truly unlimited data & call plans, with service durations from 1 to 30 days.
- Local Number: Available in many ByteSIM plans for various countries, including the USA, Canada, UK, France, Thailand, Australia, Vietnam, and more, allowing you to receive calls and SMS seamlessly.
APP:
Support:
- Frequently Asked Questions
- Email: service@bytesim.com
- WhatsApp: +852 9243 7776
Contact info
China Resources Building, 26 Harbour Road, Wan Chai, Hong Kong
- service@bytesim.com
- bytesim.com
4.8
Excellent
4K reviews
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Replied to 100% of negative reviews
Typically replies within 24 hours
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Great price and service
Great price and service, and what's impressed me even more is the service. I accidentally used all my data during the night, and was a bit confused when the service did not work. I sent an email and got a really quick answer, and what's more, the internet was working even when I used all my data, but at a very low speed. Definitely, that's now my favourite service for travelling abroad. Thanks, guys, keep going!
March 23, 2026
Unprompted review
Traveled to US
Traveled to US
Sim wouldn’t activate on the requested day. they gave some rubbish excuse and wouldn’t extend it by that day so less than I paid for.
There are plenty of other providers I have used that work better.
March 21, 2026
Unprompted review
Reply from ByteSIM
Hi Swampy,
we’re sorry to hear about your experience and understand your frustration regarding the activation timing.
To clarify, our eSIM plans are typically activated automatically when the eSIM first connects to a supported network at the destination, rather than by a manual date selection. In some cases, differences in time zones or early/late network connection can make it seem like the plan started earlier than expected.
That said, we understand how important it is to have the full number of days you paid for, and we’re sorry if this wasn’t clearly explained or handled to your satisfaction.
If your plan started earlier than intended or you feel you lost valid usage time, please contact us with your order number — we’ll be happy to review your case and provide a fair solution, including compensation where appropriate.
Thank you for your feedback — it helps us improve both our service and communication.
Kind regards,
Sunny
ByteSIM Support Team
Don’t use it in India
Avoid this eSIM for India. I used this service from March 5th to 19th and had a consistently terrible experience. The reception was unreliable, often cutting out entirely for no reason, and I never once picked up a 5G signal. Even after contacting customer support, the issues remained unresolved. Save your money and look elsewhere.
March 5, 2026
Unprompted review
Reply from ByteSIM
Hi Patrick,
we’re truly sorry to hear about your experience in India and understand how frustrating unstable connectivity can be during travel.
Regarding network performance, India is a large and diverse market where coverage and speed can vary significantly by region. While 5G is available in some major cities, it is not yet consistently stable nationwide, and many areas still rely on 4G or experience fluctuations.
To improve reliability, our India eSIM is designed to connect to multiple major networks (including Jio and Airtel) rather than a single operator. This allows your device to access a broader coverage footprint and often provides a more stable experience compared to being limited to just one local network.
That said, we’re sorry that your experience did not reflect this — in some cases, manually switching networks or adjusting settings can significantly improve performance, and our support team is always available to assist with that in real time.
If you’re open to it, please contact us with your order number, and we’ll gladly review your case and check if a refund can be arranged based on your usage.
Thank you again for your feedback — it helps us continue improving.
Kind regards,
Sunny
ByteSIM Support Team
Vietnam eSIM with "a local number - incoming SMS only"
I purchased an eSIM for Vietnam that was advertised as having 'a local number -incoming SMS only'. Objectively speaking, the SMS function was advertised as its primary feature.
It also stated, 'SMS at no extra cost and is useful for registering with services like Grab.'
Despite the statements, my registeration for most local apps, including the ride-hailing apps, because I couldn't receive a verification code via SMS.
This can be perceived as deceptive behavior and a huge lack of consideration for users.
The first operator unilaterally refused, saying 'unable to assist', without even investigating my problem.
The next operator took some time to understand it correctly, but finally admitted there were the errors on their website, stating, "Our esim can not be used for registration and we'll revise it" and issued a full refund.
I acknowledged this is a sincere response to the fact that you sell the products with the incomplete function that cannot be used for authentication and failed to properly inform users of this fact.
March 4, 2026
Unprompted review
Reply from ByteSIM
Hi,
thank you for taking the time to share your detailed feedback — and we’re truly sorry for the frustration this caused.
We would like to clarify an important point regarding “local number with incoming SMS”:
While the eSIM does support receiving standard SMS, verification (OTP) messages from certain platforms — such as ride-hailing apps, banks, Google, or WhatsApp — are not guaranteed. This is due to platform-level restrictions, not the SMS capability itself.
In many countries, especially in Southeast Asia, app providers apply strict filtering rules for verification messages. Numbers that are not tied to full local identity registration (KYC) or that are used in roaming/data eSIM scenarios may be blocked or deprioritized for OTP delivery. This is part of broader anti-fraud and compliance measures implemented by those platforms.
We understand this can be confusing, especially when SMS is mentioned as a feature. To avoid misunderstanding, we are continuously improving how we present this limitation more clearly on our product pages.
We’re also sorry for the inconsistency in support you experienced — that is not the standard we aim for.
If you still need assistance or have further questions, please feel free to contact us with your order number. We’ll be happy to review your case and assist further.
Thank you again for your feedback — it genuinely helps us improve.
Kind regards,
Sunny
ByteSIM Support Team
Clear instructions and prompt service
Clear instructions and prompt service, would like to commend Tina for helping me, especially when I was trying to get the problem solved, she was prompt and patient.
March 18, 2026
Helpful agent for setup
Chatting with the agent on how to set up was super helpful. Great service!
March 3, 2026
Simply did not work
Simply did not work. Although the plan I bought for Vietnam was inexpensive and installation was easy, my phone kept telling me I was offline. I finally gave up, deleted it, and bought a similar plan from a competitor. I was online in minutes. Would not buy again!!
March 15, 2026
Unprompted review
Reply from ByteSIM
Hi Chris,
we’re sorry to hear that the eSIM didn’t work as expected during your trip to Vietnam. We understand how frustrating it is when you need connectivity while traveling.
In Vietnam, when a device shows “offline” after installation, it is usually related to settings such as APN configuration, network selection, or data roaming being disabled. In most cases this can be resolved quickly with a small adjustment, which is why our support team is available to assist customers in real time.
We’re sorry that the issue wasn’t resolved during your trip. If you had contacted us while traveling, we would have been happy to help troubleshoot immediately.
If you’re open to it, please contact us again with your order number, and we’ll gladly review your case and check whether a refund can be arranged based on the usage status.
Thank you for sharing your feedback — it helps us continue improving the service.
Kind regards,
Sunny
ByteSIM Support Team
I bought e-sim vor vietnam and…
I bought e-sim vor vietnam and thailand. Internet was very good, customer support very fast and effective
March 2, 2026
I wrote byte sim on what’s app because…
I wrote byte sim on what’s app because I couldn’t use my eSIM on arrival and they helped me until it worked!
March 12, 2026
French Polynesia, great coverage
Coverage was great throughout French Polynesia (Raeatea, Tahiti, Moorea, fakarava) solid connection, very fast setup and registration of eSim. Using Orange over F-Vini, good carrier for sure..
March 5, 2026
Quick response and answered your…
They responded quick and answered your questions promptly, I trust their services and feel confident with them. I had asked refund from them due to my holiday destinations changed, there was no questions and refunded immediately. I give them thumbs up.
March 4, 2026
Support is responsive.
March 3, 2026
I had a great experience with support…
I had a great experience with support team. They were very professional, responded quickly, and managed to fix my problem without any hassle. The whole process was smooth and efficient. I really appreciate their helpful and friendly service.
February 25, 2026
Problem resolved in a prompt and timely manner.
Had problems installing my eSim 12 hours before my flight. The online chat support help me resolved my problems in a quickly and in a friendly manner.
March 9, 2026
Unprompted review
Worked flawlessly in the five countries…
Worked flawlessly in the five countries we visited. When it did not work in one country, they were easy to contact, easy to work with. Turned out it was my error as that country was not included in the plan. My wife used another well know esims and that did not work well at all. Next time, we will both use ByteSim
February 4, 2026
Unprompted review
Very helpful and prompt when we needed…
Very helpful and prompt when we needed help. Would recommend this company for esims when travelling
February 16, 2026
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