What Is eSIM Roaming — And Why It's Changing How We Travel
eSIM roaming is different from traditional roaming — and much cheaper. Learn how it works, what to expect, and how to avoid bill shock abroad.
Every year, millions of travellers return home to unexpected phone bills — hundreds of pounds in roaming charges they didn't anticipate. eSIM has fundamentally changed the equation. Here's what you need to know.
What is mobile roaming?
When you take your phone abroad, it can't connect to your home network because that network doesn't have towers in the country you're visiting. Instead, your phone connects to a local network — and your home carrier charges you for using it. This is roaming.
Roaming itself isn't the problem. Staying connected abroad is essential. The problem is the price and the unpredictability of traditional carrier roaming.
The problem with traditional roaming
Traditional carrier roaming charges are notoriously high and complex:
- Data rates outside the EU can reach $5–$8 per megabyte on some carriers
- Daily roaming add-ons ($6–$15/day) often cap your data at just 1–2 GB
- Background app data (updates, notifications) can burn through allowances invisibly
- Some carriers charge per kilobyte with no warning when you exceed daily caps
- Calling home is billed separately — often $1–$3 per minute
The EU exception
Since 2017, EU legislation requires carriers to include roaming across EU/EEA countries at no extra charge. However, Brexit means UK carriers' 'Roam Like Home' policies vary, and travel outside the EU still attracts significant charges.
How eSIM changes roaming
With an eSIM, you bypass your home carrier's roaming rates entirely. Instead of using your UK or home number's contract abroad, you install a local data plan from a provider like Vyroam that provides connectivity through third-party eSIM providers, enabling access to local mobile networks.
The result: you pay local data rates, not international roaming rates. A week of data in Japan that might cost $70+ through a UK carrier roaming plan can cost $8–$15 through a Vyroam eSIM.
Technically, your eSIM still 'roams' — it connects to a local network rather than operating one. But the commercial arrangement is entirely different: instead of your carrier charging you a premium for that access, you've pre-purchased direct local access at a much lower rate.
Cost comparison
| Option | 7 days in Japan | 7 days in USA | 7 days in Europe |
|---|---|---|---|
| UK carrier roaming (typical) | $60–$105 | $42–$84 | Included (varies) |
| Local SIM card | $10–$20 | $15–$25 | $8–$20 |
| Vyroam eSIM | From $8 | From $6 | From $6 |
How Vyroam handles it
Vyroam plans are prepaid — you choose your data amount before you travel and pay a fixed price. There are no overage fees. When your allowance is used, your connection stops (or slows, depending on the plan). You'll never receive a surprise bill.
Your home SIM stays active in dual-SIM mode, so you can still receive calls and texts on your home number. Only data is routed through the Vyroam eSIM.
Stop paying roaming rates
Find a local data plan for your destination Fixed price, no surprises.
Tips to avoid bill shock abroad
- Turn off 'Data Roaming' on your home SIM as soon as you install your eSIM — prevents accidental home-SIM data usage
- Set your Vyroam eSIM as the primary data connection in phone settings
- Turn off automatic app updates over mobile data before you travel
- Use Wi-Fi for large downloads like maps or streaming
- Check your data usage in Settings to monitor your allowance
- Buy a slightly larger plan than you think you need — unused data is better than running out on a remote island
Frequently asked questions
In terms of network connection, yes — you connect to the same local towers. The difference is commercial: with eSIM, you've pre-paid a local rate rather than paying your home carrier's roaming premium.
Yes. In dual SIM mode, your home SIM handles calls and texts while the Vyroam eSIM handles data. On compatible dual-SIM devices, you can usually keep receiving calls and texts on your home number — availability depends on your home carrier's international roaming support.
Your data connection stops or slows. There are no automatic top-ups or unexpected charges. Simply purchase a new plan if you need more data.
Speed is determined by the local network, not by whether you're using eSIM or a SIM card. Both eSIM and local SIM connect to the same physical towers — speeds depend on which networks are available to your specific plan and signal conditions at your location.
Counterintuitively, you may need to turn ON 'Data Roaming' in your eSIM settings. Your home country is the eSIM's 'home' network — using it abroad is technically roaming even though that's exactly what it's designed for.