If you've been searching for an honest Yesim review, you're in the right place. I've tested a lot of travel eSIMs across dozens of trips, and Yesim keeps coming up in conversations with UK travellers. So here's what I actually think, without the marketing fluff.
What Is Yesim and Who Is It For?
The Provider at a Glance
Yesim is a prepaid virtual SIM card provider. No physical chip, no queuing at the airport, no roaming shock on your next bill. You buy a plan, install the eSIM on your phone in minutes, and you're online.
The company targets independent travellers: people who book their own trips, research their own spots, and want connectivity sorted before they land. That's most UK travellers I know.
What sets Yesim apart from a basic eSIM reseller is its own technology stack and the Unlim day pass model, which I'll cover in detail below.
A Community of Over 3.5 Million Users
Yesim claims over 3.5 million users worldwide. That's not just a vanity number. A user base that size generates real-world feedback, which feeds into app updates and network improvements.
On Google Play, the App Store, and travel forums like Reddit, the overall sentiment is positive. There are recurring gripes, which I'll flag honestly, but the broad picture is of a service that works.
How Does Yesim Actually Work?
Installation: App or QR Code
Setting up a Yesim eSIM is straightforward. There are two routes:
- Via the Yesim app (available on Google Play and the App Store): buy your plan in-app, and the eSIM installs automatically.
- Via QR code: scan it from your phone's settings, and you're done.
The whole process takes 5 to 10 minutes from purchase to live signal. I've done it in airport lounges, hotel lobbies, and once on a train platform. It works.
One thing to check first: your phone needs to be unlocked (not tied to a specific UK carrier like EE or Vodafone). If you bought your phone outright or have finished your contract, you're almost certainly fine.
SwitchLess: Automatic Network Selection
Once your eSIM is active, Yesim's SwitchLess technology kicks in. This means your phone automatically connects to whichever local network has the strongest signal at any given moment.
In practice, this matters a lot in countries where coverage is patchy. Think rural areas in Southeast Asia, parts of the Middle East, or mountain regions in Europe. Instead of being stuck on one weak network, your eSIM hops to a better one without you lifting a finger.
The switch happens without any visible drop in connection. That's the kind of thing you only appreciate when you've been burned by a single-network eSIM in a bad signal area.
Coverage: 200+ Destinations and Plan Types
Country, Regional and Global Plans
Yesim covers more than 200 destinations. For UK travellers, the most relevant plan types are:
- Country plans: data for a single destination, ideal for a straightforward holiday.
- Regional plans: cover multiple countries on the same continent, great for a European road trip or a multi-stop Asia itinerary.
- Global plans: for frequent travellers who move between continents regularly.
Coverage is strong across popular destinations: Europe, the US, Southeast Asia, the Middle East, Japan, and Australia. For less-travelled destinations, I'd always recommend double-checking the country list on Yesim's site before buying.
The Unlim Plans: Unlimited Daily Data
This is Yesim's standout feature in the travel eSIM market.
The Unlim plans work like day passes. You pay for a set number of days, and you get unlimited data each day. No counting gigabytes, no running out mid-trip. For UK travellers who rely on Google Maps, upload photos daily, or stream content in the evening, this is genuinely useful.
The honest caveat: like most "unlimited" mobile plans, very heavy usage within a single day can trigger speed throttling (a temporary reduction in connection speed). This is standard practice across the industry, not a Yesim-specific issue. For typical travel use, you won't hit that ceiling.
If you're a light user who just needs maps and messaging, a standard data plan will likely be cheaper. If you're a heavy user or a digital nomad, Unlim is probably the smarter choice.
Pricing: What Does Yesim Actually Cost?
How the Plans Are Structured
Yesim's pricing varies by destination, data volume, and duration. Standard data plans start at a few pounds for European destinations.
Unlim day passes are priced per day, with the daily rate decreasing when you buy more days upfront. This rewards travellers who plan ahead, which most of us do when we're booking flights and accommodation weeks in advance.
For UK travellers, one practical advantage: Yesim bills in a transparent way, and the pricing shown is what you pay. No unexpected currency conversion fees eating into your budget.
The Cost Per GB: Where to Pay Attention
The one area where Yesim isn't always the cheapest option is cost per GB on short plans or niche destinations. If you're heading somewhere off the beaten path and only need a small amount of data, it's worth comparing with alternatives before committing.
For popular destinations and multi-day trips, Yesim's pricing is competitive. For a quick weekend in Paris or a week in New York, you're unlikely to find a dramatically better deal elsewhere.
Referral Programme
Yesim runs a referral programme: invite a friend, they buy an eSIM, and you earn credit on your account. If you travel in groups or regularly recommend travel tools to friends, this adds up over time.
There's no known active promo code at the time of writing. I won't make one up.
The App: Managing Your eSIM Day to Day
Real-Time Usage Tracking
The Yesim app is where you manage everything. You can track your data consumption in real time, which is genuinely useful when you're on a fixed-volume plan and want to avoid running out on day three of a ten-day trip.
Recharging or adding a new plan is done directly in the app, in a few taps. No need to buy a new eSIM from scratch: you top up or add a plan to your existing eSIM.
Hotspot and Tethering
Hotspot (tethering) is included on the majority of Yesim plans. This means you can connect your laptop or tablet through your phone, which is essential if you're working remotely or need to get online on a device that doesn't have its own eSIM.
For UK digital nomads and remote workers travelling abroad, this is a non-negotiable feature. Yesim ticks that box.
A few other practical features worth mentioning:
- Manage multiple eSIMs from a single account.
- Full purchase and usage history in the app.
- Notifications when your plan is running low.
The app is available on Google Play and the App Store. Ratings are generally positive. Some Android users on older or mid-range devices report occasional sluggishness, but nothing that makes the app unusable.
Device Compatibility: Will It Work on Your Phone?
Supported Devices
Most modern smartphones support eSIM. The main compatible families for Yesim:
- iPhone: XS and later (excluding the first-generation iPhone SE).
- Samsung Galaxy: S20 series and later, select Z Fold and Z Flip models.
- Google Pixel: Pixel 3 and later.
- iPad: most recent models with cellular connectivity.
This list isn't exhaustive. Compatibility also depends on your exact model and where you bought your phone.
Check Before You Buy
If you bought your phone through a UK carrier on a contract, it may be network-locked, which can prevent third-party eSIMs from working. Check that your device is unlocked before ordering.
You can verify eSIM compatibility directly on the Yesim app or website. It takes 30 seconds and saves a lot of hassle.
Customer Service and Reliability
24/7 Support
Yesim offers 24/7 customer support, accessible through the app via live chat. This matters more than people realise. Connectivity problems don't happen at convenient times. They happen at midnight when you've just landed, or on a Sunday morning when you're trying to navigate an unfamiliar city.
User reviews generally praise the support team's responsiveness. A minority of reviews mention variable response times during peak periods, which is worth knowing.
Refund Guarantee
Yesim offers a 100% refund guarantee if the eSIM doesn't work as expected. The exact terms and eligibility conditions are on their website. Read them before buying, as you would with any online service.
What UK Users Are Saying
Trustpilot Score
Yesim holds a score of around 4.3 out of 5 on Trustpilot, based on a substantial volume of reviews. That's a solid rating in the travel eSIM sector.
« Used Yesim across three countries in Southeast Asia. The Unlim plan meant I never had to worry about data. Setup took five minutes and the connection was rock solid throughout. »
Trustpilot customer review
Positive reviews consistently highlight easy installation, reliable connectivity, and responsive support. The most common criticism is cost per GB on certain destinations, particularly for shorter trips.
Recurring Friction Points
Reading through reviews on Trustpilot, Google Play, and Reddit, a few themes come up repeatedly:
- Speed reduction on Unlim plans after very heavy daily usage.
- Android app performance on some mid-range or older devices.
- Price per GB on short-duration or niche-destination plans, occasionally less competitive than Airalo or Saily.
None of these are dealbreakers. But they're worth knowing before you commit.
Verdict: Who Should Use Yesim?
Yesim Works Well For
- Frequent travellers who want one app to manage all their eSIMs across multiple trips.
- Heavy data users who benefit from Unlim day passes (streaming, uploading, GPS navigation all day).
- Digital nomads and remote workers who need reliable hotspot functionality.
- Group travellers who can make use of the referral programme.
- Multi-destination trips where a regional or global plan makes more sense than buying country by country.
When to Consider an Alternative
- Short trips to a single destination where you want the lowest possible cost per GB: Airalo or Saily may edge it on specific markets.
- Older or budget Android devices: the app experience may be less smooth.
- Very niche destinations: a specialist local eSIM provider might offer better coverage or pricing for specific regions.
