HolySim Review 2026 - Is HolySim's eSIM reliable?
At a glance
Reviews & ratings
Pros & cons
👍 What we like
- ✓Catalog of 193 destinations with local, regional and global plans.
- ✓Immediate delivery by e-mail after payment.
- ✓No mandatory app to install and use the eSIM.
- ✓Wide choice of plan formats, fixed or daily.
- ✓E-mail support available 24/7 in English, Dutch and German.
- ✓Ability to recharge an eligible eSIM up to ten times before its expiration date.
👎 What we like less
- ✗Plans are data-only and do not include a number, calls or standard SMS.
- ✗Hotspot sharing depends on the chosen plan, except specific cases like Turkey plans.
- ✗Validity start rules vary according to plans and must be checked before installation.
- ✗Compatibility requires an unlocked eSIM device.
- ✗Recharges are only available for some still valid eSIMs.
- ✗Support information is limited to e-mail.
What is HolySim?
What is HolySim?
HolySim is a Dutch provider of prepaid data-only eSIMs for international travel. Its plans provide mobile Internet access without replacing the physical SIM card and without providing a new phone number. After payment, the eSIM and its QR code are sent by e-mail. The catalog includes fixed plans from 1 to 300 GB valid for 30 or 31 days, daily plans of 1, 2, 5 or 10 GB per day for 1 to 60 days, as well as local, regional and global offers. Validity can start at installation, on first network connection or at manual activation depending on the plan. The user installs the eSIM profile with a Wi-Fi connection, selects HolySim as mobile data line and enables data roaming for this line. The usual SIM card can remain active to keep its number and call and SMS services.
Plans overview
Destinations covered by HolySim
Coverage broken down by region. Tap a region to see its countries.
Our verdict
HolySim offers data-only eSIMs for 193 destinations, delivered instantly by e-mail with a QR code. Its fixed, daily, regional and global plans suit travelers who want to keep their usual SIM card while avoiding roaming.
Popular alternatives
Frequently asked questions
No, HolySim is not a scam: it is a reliable, well-known eSIM with a 3.8/5 rating in our test, coverage across 193 destinations and access to local 4G/5G networks (speed depends on local coverage). Just make sure your phone is eSIM-compatible before buying.
HolySim covers more than 193 destinations. Availability and network quality depend on the destination and the local partner operator: check that your travel country is covered before buying.
The main downsides we found in our test: Plans are data-only and do not include a number, calls or standard SMS, Hotspot sharing depends on the chosen plan, except specific cases like Turkey plans, Validity start rules vary according to plans and must be checked before installation, Compatibility requires an unlocked eSIM device, Recharges are only available for some still valid eSIMs and Support information is limited to e-mail.
It depends on your destination and budget: HolySim scores 3.8/5 in our test, but the best value changes by country. Compare current deals in our comparator before choosing.
Choose a fixed or daily plan depending on your usage. Daily plans allow selecting a duration of 1 to 60 days, while fixed plans usually offer 30 or 31 days of validity.
No. HolySim eSIMs are data-only and provide neither phone number nor minutes for calls or standard SMS. Calls and messages can work via apps using the Internet.
Yes. The usual SIM card can remain active to keep your number, calls and SMS. Select HolySim as your mobile data line and check roaming settings of your usual SIM.
Hotspot sharing depends on the plan. It is allowed on all Turkey plans, while other offers must be checked in their details.
Yes, if the eSIM and plan are eligible and still valid. Recharge is done from the My eSIM page, keeps remaining data and can be done up to ten times.
Validity can start at installation, on first network connection or after manual activation. The applicable rule is indicated on the plan page and in the received e-mail.
Recent iPhones, recent Samsung Galaxy devices and recent Google Pixel phones generally support eSIM. The phone must also be carrier unlocked.
Cancellation is free as long as the eSIM has not been delivered. After delivery, a refund may be considered if the eSIM does not work due to HolySim or its provider, provided the request is sent within 30 days.
What to do if HolySim doesn't work?
Check Wi-Fi connection, eSIM compatibility and device carrier unlocking. Do not delete an already installed eSIM without contacting support.
Make sure the HolySim line is enabled for mobile data, data roaming is allowed and network selection is automatic. Then restart the device.
Check the plan activation rule in the e-mail or on its page. According to the offer, validity starts at installation, first connection or after manual activation.
Check that the eSIM and plan are still valid. After payment, recharge usually arrives within minutes, but usage display may take longer. Contact support if it remains absent.