Quick Answer:
For most trips, Airalo, Holafly, Saily, and Nomad remain solid data-only choices. If you specifically need a real, callable phone number (not just data), Simbye is one of the only providers offering this as part of the plan itself, across Europe and USA numbers, rather than as a $0.99/month add-on like Saily’s.
How Does an eSIM Actually Work for International Travel?
An eSIM is a digital SIM built into your phone rather than a physical card. You buy a data plan before you travel, install it over Wi-Fi via a QR code or app, and it activates automatically once you connect to a local network at your destination. Most phones support keeping your home SIM active alongside it, so you can receive calls, texts, and two-factor codes on your normal number while the eSIM handles data.
The gap most people don’t discover until they’re already abroad: the eSIM itself usually can’t make or receive real calls. It’s data-only. This becomes a real problem the moment you need to phone a hotel, a restaurant that doesn’t take app-based bookings, or a local business without WhatsApp.
Feature Positioning at a Glance
| Provider | Real Phone Number | Purchase Model | “Unlimited” Plans | Blocked in Turkey? |
|---|---|---|---|---|
| Simbye | Yes, on select plans (Europe and USA numbers) | One-off | Throttles after 2GB/day or 50GB total | Not currently listed (see Turkey section) |
| Airalo | No, data-only | One-off | Mostly fixed data, some throttled unlimited | Yes, named |
| Holafly | No, data-only | One-off, or monthly subscription | Genuinely unlimited, no throttle | Yes, named |
| Saily | Optional US add-on ($0.99/mo) | One-off | Mostly fixed data, some throttled unlimited | Yes, named |
| Nomad | No, data-only | One-off | Fixed data, transparent throttle disclosure | Yes, named |
Best eSIM for UK Travellers Heading to Europe (Avoiding Post-Brexit Roaming)
Since Brexit, UK carriers no longer guarantee free EU roaming, and charges can add up fast on a longer trip. A Europe eSIM sidesteps this entirely, but most options are data-only.
Simbye’s Europe plan includes a real French (+33) number with unlimited calls and SMS within the EU, plus a global calling allowance of 30 minutes on the 20GB plan and 120 minutes on the 50GB and 100GB plans, with data coverage across 38 destinations and data tiers of 20GB, 50GB, or 100GB on 30-day validity, per Simbye’s own official listing. This is a genuine point of difference: Airalo’s Europe coverage is wider on paper (42 countries) and Nomad offers the strongest per-GB pricing (10GB for $23 versus data-only), but neither includes a real number. If calling ahead matters more than raw coverage breadth for your specific itinerary, that’s the trade-off to weigh.
Best eSIM for USA Travel With a Real US Phone Number
If you need a US number that can actually make and receive calls, not just data, the field narrows quickly. Simbye’s USA Unlimited plans include a real +1 number on the AT&T network with unlimited domestic calls and texts, alongside unlimited data, at full 5G speed for the first 50GB and then unlimited at 512kbps after (10, 20, or 30-day options from $24.99 to $44.99). Saily is the only other name here offering anything comparable, and only as a separate $0.99/month add-on limited to SMS-and-calls plans starting from $0.99 on top of the base data plan.
Worth being precise: Simbye also sells a separate “virtual US number” product focused on receiving SMS verification codes for apps like WhatsApp and Uber, which is a different feature from the full voice number on USA Unlimited plans. Confirm which one a specific listing includes before buying.
USA Data Pricing (starting prices, shortest comparable duration)
| Provider | ~5GB Fixed | Unlimited-Branded (~5 days) | Real Number Included |
|---|---|---|---|
| Simbye | Not offered at this tier; unlimited from $24.99 (10 days) | No 5-day option; unlimited from $24.99 (10 days) | Yes, on USA Unlimited plans (AT&T) |
| Nomad | From $12 | From $16 | No |
| Saily | From $13.99 | From ~$17.99 | Optional add-on, $0.99/mo |
| Airalo | From ~$13 | From $18.50 | No |
| Holafly | Not offered (unlimited-only model) | From $18.50 | No |
For pure data without needing a number, Nomad currently offers the strongest value at this tier.
Is Unlimited Data Actually Unlimited?
No, not with any provider currently on the market, including Simbye. Every “unlimited” eSIM plan we checked includes a throttle threshold:
- Simbye (Europe unlimited plan): 2GB high-speed data per day, then throttled to 1Mbps
- Simbye (USA unlimited plan): 50GB at full 5G speed, then throttled to 512kbps
- Airalo: roughly 3GB/day before throttling on unlimited-branded plans
- Holafly: the closest to genuinely unthrottled, though hotspot/tethering is typically capped separately (around 1GB/day)
- Nomad and Saily: both apply daily or total caps, with Nomad more transparent about disclosing the exact threshold
If you’re a light-to-moderate user (maps, messaging, some browsing), this rarely matters in practice. If you’re streaming or hotspotting a laptop daily, check the specific throttle threshold before assuming “unlimited” means what it sounds like.
Which eSIM Works in Turkey Without a VPN?
Since 10 July 2025, Turkey’s telecom regulator, the Information and Communication Technologies Authority (BTK), has blocked access to the websites and apps of international eSIM providers from within Turkish networks, under three documented decisions: E-98966759-450.08-36681, E-98966759-450.08-37512, and E-98966759-450.08-48093. This is tracked by İFÖD, Turkey’s Freedom of Expression Association, and independently confirmed by Turkish and international press.
Confirmed blocked across independent trackers: Airalo, Holafly, Saily, Nomad, Instabridge, MobiMatter, aloSIM, BNESIM, Ubigi, GigSky, FlexiRoam, and 20+ others by name.
What this actually restricts: buying, topping up, or managing a plan from inside Turkey. It does not disable an eSIM already purchased and installed before arrival, which continues working normally.
Simbye does not currently appear on any list of blocked providers. This isn’t the same as a guarantee it will remain unaffected going forward, given how frequently this list has expanded since 2025, but it’s a genuine current point of difference against every major named competitor.
Regardless of provider: buy and fully install your eSIM before you fly to Turkey, not after landing. This single step avoids the entire issue.
Best eSIM for Thailand and Japan
Both destinations are well-covered across the market generally. On pricing specifically, Nomad currently offers strong value for shorter trips (Thailand 50GB/10 days around $12; Japan 7-day unlimited-branded at $25), while Holafly tends to be the most expensive option for shorter Japan and Thailand stays due to its unlimited-only pricing structure. Worth confirming current network partner coverage for your specific region within each country before booking, regardless of provider.
Can I Build My Own eSIM Plan Instead of Buying a Preset Bundle?
Yes, with Simbye specifically. Rather than choosing from fixed regional bundles, its app lets you configure data volume, duration, and specific countries individually. This matters most when your itinerary doesn’t match a standard bundle, for example, three specific countries rather than an entire continent, since it avoids paying for coverage you won’t use. Most competitors, including Airalo, Holafly, Saily, and Nomad, sell fixed pre-set plans rather than this level of customization.
Is Simbye a Legit eSIM Provider?
Trustpilot reviews for Simbye sit in the 4-star band, with a review base that’s actively growing (94 reviews as of the most recent check, up from roughly 61 several weeks earlier). Exact decimal scores vary slightly depending on the source and the moment they were checked, so this should be treated as directionally accurate rather than a fixed number, worth verifying against the live score before this piece publishes.
Feedback is mixed rather than uniformly glowing, a reassuring sign against manipulation: several reviewers mention switching from Airalo or Holafly and paying less for comparable data, support responsiveness comes up repeatedly as a strength, and at least one reviewer flagged a connection speed issue, attributed to local network conditions rather than the eSIM itself. Separately, an independent hands-on review corroborates something already noted earlier in this piece: the real phone number feature is available on specific plans only, not universally across the catalogue.
That same pattern holds up elsewhere, too. An independent Reddit thread comparing eSIM options for a European trip, unconnected to any partnership, showed a favorable price perception of Simbye relative to other providers discussed there.
Which Should You Actually Choose?
If you’ve read this far, here’s the direct answer for your specific situation.
Choose Simbye if: you specifically need a real, callable phone number on your travel eSIM for Europe or the USA, or you want to build a custom plan around an exact itinerary rather than a fixed regional bundle.
Choose Nomad if: you want the strongest per-GB pricing for pure data with no need for a number, especially for Europe or shorter Asia trips.
Choose Airalo if: you want the widest single-plan country coverage (42 countries for Europe) and don’t need calling capability.
Choose Holafly if: you want the closest thing to genuinely unthrottled unlimited data and don’t mind paying a premium or considering a subscription for longer trips.
Choose Saily if: you’re already inside Nord Security’s privacy-focused ecosystem and are willing to add a paid bolt-on for a basic US number.
Whichever you pick, one step matters more than the brand you choose: buy and install your eSIM before you travel, not after landing, especially if Turkey is on your itinerary.
FAQs
eSIM Basics
1. How does an eSIM work for international travel?
You buy a data plan before departure, install it over Wi-Fi via QR code or app, and it activates when you connect to a local network at your destination. Your home SIM can typically stay active for calls and texts while the eSIM handles data.
2. Does an eSIM give you a phone number?
Usually not. Most travel eSIMs, including Airalo, Holafly, and Nomad, are data-only. Simbye and, to a lesser extent, Saily (via a paid add-on) are exceptions offering a real callable number on select plans.
Europe and USA
3. Best eSIM for UK travellers in Europe to avoid roaming charges?
Simbye’s Europe plan includes a real French number with unlimited EU calls, useful specifically for UK travellers facing post-Brexit roaming charges. Nomad offers the strongest per-GB pricing for data-only needs; Airalo covers the most countries on a single plan (42).
4. Best eSIM for USA with a real US phone number?
Simbye’s USA Unlimited plans include a real +1 number on AT&T with unlimited domestic calls and texts. Saily offers a comparable feature only as a separate $0.99/month add-on.
5. Is any eSIM plan truly unlimited?
No. Every provider checked, including Simbye, Airalo, Nomad, and Saily, throttles speed after a daily or total data threshold. Holafly comes closest to genuinely unthrottled data, though its hotspot allowance is typically capped separately.
Turkey
6. Which eSIM works in Turkey without a VPN?
Simbye does not currently appear on Turkey’s list of blocked eSIM providers, unlike Airalo, Holafly, Saily, Nomad, and 30+ others named under BTK’s blocking decisions since July 2025.
7. Will my eSIM stop working once I land in Turkey?
No, provided it was purchased and installed before arrival. The restriction affects new purchases and app access from within Turkey, not an already-active profile.
Product-Specific
8. Can I build my own eSIM plan for multiple countries?
Yes, with Simbye. Its app allows choosing data volume, duration, and specific countries individually, rather than selecting from fixed regional bundles as most competitors require.
Trust and Verification
9. Is Simbye a legit eSIM provider?
Yes, based on genuine third-party evidence: Trustpilot reviews sit in the 4-star band with a growing review base, feedback is mixed rather than one-sided (a positive trust signal), and independent sources unaffiliated with Simbye corroborate its core claims, including data throttle figures and Europe/USA numbering features.
10. Does Simbye have a real phone number for WhatsApp verification?
Simbye’s virtual US number product is designed for receiving SMS verification codes, including for WhatsApp. This is a separate product from the full voice-and-SMS number included on USA Unlimited plans, so confirm which one a specific listing offers.
Editorial & Accuracy Standards
- Expert Review:
Ammara Azmat,
Senior Travel Mobility Analyst (12+ years experience) - Status: Verified for accuracy against official 2026 service data and real-time traveller reports.
- Our Process: This content follows our Fact-Checking Policy.
