One eSIM. 40+ European countries. Just top up as you go. SLYNUMBER's global eSIM covers every EU and EEA member, the UK, Switzerland, the Western Balkans, and beyond — under a single profile.
By SLYNUMBER Editorial, eSIM & Travel Tech · ·
Europe data rate
from 2$ per GB
/ per GB
Your purchase includes:
One eSIM that works across 40+ European countries
Pay-as-you-go data credits that never expire
Per-country rates vary — only pay for where you actually travel
*One-time $5 eSIM activation fee applies. Data credits are purchased separately.
!
Do I need a different eSIM for each European country? No - the same SLYNUMBER eSIM works across every European country we list. Cross from France into Germany, Italy, or Spain and your device just keeps working — per-country rates are billed automatically.
Key Takeaways: • One eSIM, 40+ countries: Cover every EU/EEA member plus the UK, Switzerland, the Western Balkans, Ukraine, and the South Caucasus — under a single profile. • Pay-as-you-go pricing: Per-country rates start at $2.00/GB. You are billed at each country's rate as you cross borders. • No roaming fees: SLYNUMBER's eSIM bypasses the hidden roaming charges typical of carrier travel passes. • Instant setup: Install via QR code on any eSIM-compatible iPhone or Android before you travel.
• Fully app managed: Monitor usage, top up, and switch between countries automatically through the SLYNUMBER app.
European multi-country trips used to mean either expensive carrier roaming bundles or buying a fresh SIM in every airport. SLYNUMBER replaces both. A single global eSIM profile auto-connects to local networks in every European country we cover, billing each country at its own published rate — typically $2.00/GB in EU and EEA markets, with a few non-EU markets at slightly higher rates.
Europe Network & Coverage Details
SLYNUMBER's Europe eSIM connects to the major host networks in each country — Orange, Vodafone, Deutsche Telekom, Telefónica, and their national subsidiaries; plus EE, O2, and Three in the UK; Swisscom, Sunrise, and Salt in Switzerland; and the leading carriers in every other listed market. Your device automatically selects the strongest signal in whichever country it lands in — no manual configuration required.
5G availability: Europe is among the world's densest 5G markets. According to Opensignal's regional Mobile Network Experience reporting, users in major Western European capitals — Paris, London, Madrid, Berlin, Rome, Amsterdam — spend between 25% and 38% of their connected time on 5G, with average 5G download speeds of 200–290 Mbps. Nordic markets (Norway, Sweden, Finland, Denmark) and Switzerland push that further, sometimes above 300 Mbps. 4G/LTE reaches over 99% of the population across the EU/EEA and the UK, per European Commission connectivity data.
Cross-border roaming note: Inside the EU/EEA, EU roaming rules already keep LTE/4G live as you cross borders without any settings change. SLYNUMBER's eSIM uses that same mechanism — plus its own global roaming agreements in non-EU European markets (UK, Switzerland, the Western Balkans, Ukraine, Moldova, Belarus, and others). Per-GB pricing is country-specific and listed on the SLYNUMBER destinations page. Credits never expire and carry across all countries.
Compatible devices: SLYNUMBER's eSIM is supported on iPhone XS and newer, Google Pixel 3 and newer, Samsung Galaxy S20 and newer (carrier-unlocked models), and most eSIM-capable tablets. To confirm before purchase, open Settings → Cellular → Add eSIM on your device.
Full European Country Coverage (40 destinations)
Tap any country to see its specific data rate, local networks, and travel tips:
Connecting with an eSIM across Europe has never been easier. With our global eSIM plan, there is no need to install a different profile in each country — the same eSIM works wherever you travel, from Lisbon to Helsinki, from Reykjavík to Athens, from London to Tbilisi. Here is the full breakdown.
You choose the amount of data plan you need and go from there, no hassle or physical SIM card required for your smartphone. Download the app and go.
QR code or manual setup
You'll receive your eSIM instantly after purchase via a QR code, with the option to install it manually if preferred. We recommend adding it to your iPhone or Android device before you arrive for a smooth start.
Activate when you land
Once you're in any European country, simply turn on the eSIM and activate your data, no roaming charges, no roaming fees, no SIM swaps, just instant high-speed internet — whether you land at Charles de Gaulle, Heathrow, Fiumicino, or Schiphol.
Control everything in the app
Use the SLYNUMBER app to monitor your data usage across all European countries, top up as needed, or switch between data package plans, all with no contracts or hidden fees.
2. What Are the Advantages of Using a SLYNUMBER Europe eSIM?
We've reimagined eSIM as more than just a travel add-on; it's a global, always-available data companion designed to keep users connected anytime, anywhere across Europe.
SLYNUMBER's eSIM works across all 40+ European countries we list, with no roaming fees or contracts. Just pay for the data package you need, and the same eSIM keeps working in Paris, London, Rome, Barcelona, Berlin, Amsterdam, Lisbon, Prague, Athens, Vienna — and across every border you cross.
Easy setup and hassle free
Your eSIM is sent instantly via email as a QR code. Install it in minutes — no physical SIMs, no waiting. Perfect for first-time European travelers or frequent flyers between EU capitals.
WhatsApp-ready
Use WhatsApp anywhere in Europe for calls, texts, and location sharing — your home number stays active throughout the trip.
24/7 support
Our customer support team is ready to assist you across any European timezone, no matter what.
3. How does SLYNUMBER's eSIM work?
Easy as 1-2-3!
1
Download the app
Download the app, select a subscription and pick your new number.
2
Follow installation instructions
Follow the provided instructions to complete the installation and activate your data plan.
3
Start using data
Your phone will automatically connect to the strongest local network in whichever European country you are in.
Your SLYNUMBER eSIM keeps your existing WhatsApp number fully active across every European country you visit — no SIM swap, no second number needed. Message friends back home from the Eurostar between London and Paris, share locations on the Madrid–Barcelona AVE, or take a WhatsApp video call from a café in Vienna's MuseumsQuartier. WhatsApp voice calls use roughly 3–8 MB per minute over your data plan, so a two-week multi-country trip with daily check-ins consumes well under 1 GB just for messaging. Group chats, photo sharing, and status updates work seamlessly as you cross from one network to another. Because SLYNUMBER data is never throttled, you will not experience the call drops that often happen on hotel or café Wi-Fi in busy tourist districts.
Instagram
Europe offers the world's densest concentration of photogenic destinations, and your SLYNUMBER eSIM lets you share them in real time. Post Stories from the Eiffel Tower at sunset, upload Reels from a gondola in Venice, or go live from the Acropolis at golden hour — all without hunting for tourist-area Wi-Fi. Uploading a 60-second 1080p Reel uses roughly 50–80 MB, a tiny fraction of the 10–15 GB most multi-country travelers budget. SLYNUMBER auto-connects to the strongest local network in each market (Orange/Vodafone in France, Deutsche Telekom/Vodafone DE/O2 in Germany, Movistar/Vodafone/Orange in Spain, EE/Vodafone/O2 in the UK, and so on). Instagram's auto-save feature backs content up locally, so even a brief signal gap inside a museum does not cost you the shot.
TikTok
Europe's streets, festivals, and landmarks make compelling TikTok content, and your SLYNUMBER eSIM gives you reliable data to create and upload anywhere — without relying on café Wi-Fi between cities. Film a POV walk down the Champs-Élysées, capture a time-lapse from the Berlin TV Tower (Fernsehturm), document a flamenco show in Seville, or upload a Tomorrowland clip directly from Boom — then post while the moment is fresh. TikTok uploads for a standard 60-second clip typically use 30–100 MB depending on resolution. The eSIM's automatic network selection ensures the strongest available signal even in crowded festival venues — Notting Hill Carnival in London, Oktoberfest in Munich, Sziget in Budapest. The SLYNUMBER app shows your live data balance per country.
Maps
Navigating Europe is straightforward with a live connection across borders. Use Google Maps to plan routes on the Paris Métro, the London Underground, the Berlin U-Bahn, or the Rome Metro without switching profiles. SLYNUMBER's eSIM provides steady 4G in every European capital and along most intercity motorways and high-speed rail corridors. For areas with occasional signal gaps — Alpine passes between Switzerland and Italy, Scottish Highlands routes, Carpathian crossings between Romania and Ukraine — download an offline map region in Google Maps before you depart. A full offline map of Western Europe requires under 1.5 GB. With your eSIM active, navigation automatically returns to live mode the moment signal resumes, keeping your route accurate throughout the journey.
5. How to activate SLYNUMBER eSIM
Check out this video for helpful tips and tricks on how to use SLYNUMBER.
6. Virtual number vs. other privacy solutions
Several options exist forkeeping your real number private. Here is how they compare across the featuresthat matter most:
Feature
SLYNUMBER
Google Voice
Burner Apps
Carrier 2nd line
Real U.S. mobile number
Yes
No
Varies
No
SMS verification for apps
Yes
Limited
Often blocked
Yes
Immune to SIM swapping
Yes
Yes
Yes
No
Custom voicemail
Yes
Yes
Rarely
Yes
International calling
Yes
Limited
Rarely
Carrier dependent
eSIM / Data plans
Yes
No
No
Carrier dependent
Number permanence
Permanent
Permanent
Temporary
Permanent
Requires carrier number
No
Yes
Varies
Yes
Starting price
$14.99 / 3 months
Free
$2–$5/week
$10–$15 add-on
7. Features and pricing
Core Features
SLYNUMBER provides real U.S. mobile numbers — not VoIP-flagged numbers that get blocked by apps and services. Each number supports:
SMS and MMS messaging, including verification codes
Inbound and outbound voice calls
Custom voicemail greetings
Call routing, forwarding, and blocking
International calling to 100+ countries
Number tagging by purpose: business, personal, dating, or travel
eSIM data plans for cellular connectivity without a local SIM
SLYNUMBER numbers are accepted by all major apps and services, including WhatsApp, Telegram, PayPal, Venmo, Instagram, Snapchat, Amazon, and Gmail.
Security
Calls and messages are transmitted over encrypted connections using Transport Layer Security (TLS) — the same encryption standard that protects online banking — and Secure Real-Time Transport Protocol (SRTP), which encrypts voice data in transit.
Pricing
SLYNUMBER offers three billing cycles. Each plan includes the same full feature set:
Quarterly: $4.99/month, billed as $14.99 every three months
Annual: $49.99/year — lowest per-month rate
Add-on credits: $10 for 1,000 credits (1 credit = 1 minute call, 1 SMS, or 1 MMS)
Platform Availability
The SLYNUMBER app is available on the App Store and Google Play Store. SLYNUMBER also includes SlyAI, a built-in AI assistant for instant help and conversation right inside the app.
8. Frequently asked questions
Does my SLYNUMBER eSIM work across all European countries?
Yes. The same SLYNUMBER eSIM works across 40+ European countries — every EU and EEA member plus the UK, Switzerland, the Western Balkans, Ukraine, Moldova, Belarus, and the South Caucasus. Your device auto-selects the strongest local network in each market. Per-GB rates are country-specific and listed on the destinations page; credits never expire and carry over between countries.
Will my eSIM keep working between Schengen and non-Schengen European countries?
Yes. The eSIM does not depend on Schengen or EU membership — it works equally across all listed European countries. EU roaming rules keep LTE/4G live inside the EU/EEA; outside that zone (UK, Switzerland, Western Balkans, Ukraine, etc.) the same eSIM profile keeps working via SLYNUMBER's global roaming agreements. The only thing that changes when you cross a border is the per-GB rate.
How much data do I need for a 2-week trip across 4 European countries?
Most travelers covering 4 European countries over 2 weeks use 8–12 GB total. Light use (maps, messaging) stays under 5 GB; moderate use (social media, streaming on trains, daily video calls) runs around 8 GB; heavy use (HD streaming, Reels uploads, hotspotting) can reach 15 GB. At $2.00/GB headline, 10 GB across the trip costs about $20 — far less than typical carrier multi-country roaming bundles.
What is a virtual phone number?
A virtual phone number is areal phone number that operates over the internet using VoIP technology ratherthan being tied to a physical SIM card. You can use it to make calls, sendtexts, activate apps, and verify accounts — all without exposing your personalcarrier number.
Does the eSIM work in the UK, Switzerland, and Norway (non-EU)?
Yes. SLYNUMBER's eSIM works in every European country we list, including non-EU markets. In the UK it uses EE, Vodafone UK, or O2; in Switzerland it auto-connects to Swisscom, Sunrise, or Salt; in Norway to Telenor, Telia, or Ice. Per-GB rates in Switzerland and Norway are typically higher than EU averages and are listed on the SLYNUMBER destinations page.
Is a virtual phone number the same as a burner number?
Not exactly. Burner numbers aretypically temporary and disposable, often lasting only days or weeks. A virtualphone number from a provider like SLYNUMBER is a permanent, real U.S. mobilenumber that supports SMS verification, voice calls, voicemail, and long-termapp activation — similar to a carrier number but without the physical SIM.
How much does a virtual phone number cost?
SLYNUMBER plans start at $4.99per month on the quarterly billing cycle ($14.99 billed every three months). Anannual plan is available at $49.99/year. Every plan includes the full featureset: calling, SMS, MMS, voicemail, call forwarding, and international dialing.
Can a virutal number prevent SIM swapping?
Yes. A virtual number is notcontrolled by a mobile carrier, so an attacker cannot call your carrier andtransfer it to a new SIM. However, you should still secure the logincredentials for your virtual number provider's account using a strong passwordand, where available, app-based 2FA (such as an authenticator app).
Does SLYNUMBER work outside of the United States?
Yes. Because the numberoperates over the internet, you can use it from anywhere with a Wi-Fi or dataconnection. SLYNUMBER is available in 150+ countries. SLYNUMBER also offerseSIM data plans for cellular connectivity while traveling, so you do not needto rely on local SIM cards or expensive roaming.
