CometSIM Review 2026 - Is CometSIM's eSIM reliable?
At a glance
Reviews & ratings
Pros & cons
👍 What we like
- ✓Clear and simple plans, data only, ideal for browsing, apps, and online work.
- ✓Large catalogue of destinations covering most world regions.
- ✓Ability to keep physical SIM card active for classic calls and SMS.
- ✓Tethering allowed on plans, useful for connecting a computer or other devices.
- ✓eSIM QR code quickly sent by email, no need to visit a store.
- ✓Use of local 4G and 5G networks, offering good speeds in many countries.
👎 What we like less
- ✗No cellular calls and SMS in plans, which may require use of messaging apps.
- ✗Prices shown only in US dollars, adding a mental conversion for users in euros.
- ✗No dedicated mobile app, management is mainly done via the website.
- ✗Predefined durations (1, 7, or 30 days) may lack flexibility for some types of stays.
- ✗Connection quality depends on local partner operators and may vary by country.
What is CometSIM?
What is CometSIM?
CometSIM is an online travel eSIM shop offering prepaid data packages for many destinations worldwide. eSIMs are delivered as QR codes sent by email, with no physical SIM card, allowing you to stay connected while keeping your regular SIM for calls and SMS. CometSIM offers plans by country, region, and worldwide, data only, with various data volumes (from 1GB to 20GB) and typical validity periods of 1, 7, or 30 days. Prices are displayed in US dollars and payment is made through secure methods. The CometSIM eSIM works on unlocked eSIM-compatible smartphones and uses 4G and 5G networks from local partner operators. Activation is done in a few steps through the phone settings after scanning the received QR code.
Plans overview
Destinations covered by CometSIM
Coverage broken down by region. Tap a region to see its countries.
Our verdict
CometSIM is a travel eSIM shop offering prepaid data plans for over 190 destinations, with QR code sent within minutes and simple plans in US dollars.
Popular alternatives
Frequently asked questions
No, CometSIM is not a scam: it is a reliable, well-known eSIM with a 3.8/5 rating in our test, coverage across 190 destinations and access to local 4G/5G networks (speed depends on local coverage). Just make sure your phone is eSIM-compatible before buying.
CometSIM covers more than 190 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: No cellular calls and SMS in plans, which may require use of messaging apps, Prices shown only in US dollars, adding a mental conversion for users in euros, No dedicated mobile app, management is mainly done via the website, Predefined durations (1, 7, or 30 days) may lack flexibility for some types of stays and Connection quality depends on local partner operators and may vary by country.
It depends on your destination and budget: CometSIM scores 3.8/5 in our test, but the best value changes by country. Compare current deals in our comparator before choosing.
CometSIM offers prepaid data plans by country, region, or worldwide, with data volumes generally ranging from 1GB to 20GB and durations of 1, 7, or 30 days.
No, CometSIM plans are exclusively mobile data plans. Calls and SMS must be made using your classic SIM or messaging apps using internet.
Yes, tethering is allowed on CometSIM plans, letting you connect a computer or other devices to your eSIM.
CometSIM mentions a possible refund up to 180 days if the eSIM has not been used. It is necessary to check detailed conditions on the website before purchase.
You must have an eSIM-compatible and unlocked smartphone. The main recent models of iPhone, Samsung Galaxy, Google Pixel, and others support eSIM.
Yes, you can keep your physical SIM active for your usual number and use the CometSIM eSIM for mobile data in parallel.
CometSIM does not provide a dedicated app, but you can track your usage via your smartphone’s mobile data settings and configure threshold alerts.
CometSIM plan prices are displayed in US dollars on the site. You can make an indicative conversion into your own currency if needed.
What to do if CometSIM doesn't work?
Check that your device is eSIM compatible and unlocked. Make sure you have a stable internet connection during installation and follow step-by-step the guide provided by CometSIM.
Ensure that the CometSIM eSIM line is selected for mobile data, that data roaming is enabled, and restart your phone if needed.
Monitor your usage in phone settings, limit high-quality video streaming, and disable automatic updates while on the move.
In your phone settings, choose the physical SIM for calls and SMS and the CometSIM eSIM line for data, verifying default line options.