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How the UK SIM and Global eSIM Work Together
Two eSIMs. One seamless experience. Zero surprises.
If your plan includes a Global eSIM (Globetrotter, Aero, Forces, RailReach, or Sail), your phone runs two SIMs side by side β your UK SIM and your Global eSIM. They work together automatically, intelligently switching between networks to keep you connected wherever on earth you happen to be.
No manual switching. No roaming passes. No bill shock. Just connection.
How It Works
Your two SIMs have one job each β and they do it brilliantly together:
eSIM | Job | Coverage |
π¬π§ UK SIM | Calls, texts & UK data | Zone A β plus calls & texts in Zone B |
π Global eSIM | Data everywhere else | 207 destinations across Zones AβD |
The moment you land somewhere new, your phone figures out which SIM should be doing what β and switches automatically. You just use your phone.
Race Around the World π
Global Roaming plans only β Globetrotter, Aero, Forces, Sail, and RailReach.
Eight destinations. Every major zone. One unbroken connection. Here's what actually happens to your SIMs as you travel eastward around the globe.
π Stop 1 β London, UK (Zone A β Roam Free)
Home. Your UK SIM is live on EE β the UK's fastest 5G network β handling calls, texts, and data. Your Global eSIM sits quietly in the background, already connected to Vodafone and Three for backup coverage across the UK (O2 coming soon).
Two networks. One city. Total reliability.
UK SIM leads. Global eSIM on standby.
π«π· Stop 2 β Paris, France (Zone A β Roam Free)
The Eurostar pulls out of St Pancras. Somewhere under the Channel, you cross into France β and absolutely nothing changes. Your UK SIM keeps working exactly as it does at home. Calls, texts, and data all included. No extra charges, no settings to change, no roaming notification to ignore.
Zone A is called Roam Free for a reason.
Zone A β everything included. Nothing to do.
π¦πͺ Stop 3 β Dubai, UAE (Zone B β Calls, Texts & Global eSIM Data)
Wheels down at Dubai International β one of the world's busiest airports. Before you've even cleared passport control, your Global eSIM has connected to a local partner network and data is live. Your UK SIM stays active for calls and texts. No airport SIM queues. No roaming passes. No surprises.
Zone B β UK SIM for calls & texts. Global eSIM for data. Automatic.
πΈπ¬ Stop 4 β Singapore (Zone B β Calls, Texts & Global eSIM Data)
The city that never stops β and neither does your connection. Singapore's world-class networks pick up your Global eSIM instantly. Your UK number stays live for calls and texts. You can video call home from Marina Bay Sands without giving your phone a second thought.
Zone B β UK SIM for calls & texts. Global eSIM for data. Seamless.
π―π΅ Stop 5 β Tokyo, Japan (Zone B β Calls, Texts & Global eSIM Data)
Narita Airport. Your Global eSIM has already found a network before your bags arrive on the carousel. Tokyo is one of the most connected cities on earth β and your CyberTel plan makes the most of it. Calls and texts on your UK number, data via your Global eSIM. Just like every other stop.
Zone B β UK SIM for calls & texts. Global eSIM for data. Instant.
π¦πΊ Stop 6 β Sydney, Australia (Zone B β Calls, Texts & Global eSIM Data)
Crossing the Pacific to Sydney. The Harbour Bridge comes into view and your connection hasn't skipped a beat. Your UK number is still live, your Global eSIM is already on an Australian network, and your Spend Shield means there's not a single unexpected charge waiting for you at the end of the month.
Zone B β UK SIM for calls & texts. Global eSIM for data. No worries.
π΅π« Stop 7 β Bora Bora, French Polynesia (Zone C β Global eSIM Data Only)
You've made it to paradise. Turquoise lagoons, overwater bungalows, and β yes β still connected. French Polynesia sits in Zone C, which means your Global eSIM handles data automatically across the islands. Calls and texts are a different story β your Spend Shield is on by default, so you won't be charged for them unless you choose to deactivate it.
Even at the edge of the world, CyberTel has you covered.
Zone C β Global eSIM for data. Spend Shield protecting calls & texts.
πΈπ§ Stop 8 β Solomon Islands (Zone D β Limited Global eSIM)
One of the most remote archipelagos on earth. Nearly 1,000 islands scattered across the South Pacific. And still β connected. The Solomon Islands sits in Zone D, which means your Global eSIM data is available but capped at 1GB per month regardless of your plan size. Your Spend Shield stays active for calls and texts by default.
This is the edge of the network. And CyberTel is still there.
Zone D β Global eSIM data capped at 1GB/month. Spend Shield on by default.
π Back in London
Your plane touches down at Heathrow. Your phone connects to EE. Your Global eSIM steps back into standby. Everything switches back automatically β same number, same plan, same bill as always.
Eight countries. Four zones. 207 destinations available. Not a single surprise charge.
Welcome home.
How It Works in Each Zone
Zone | UK SIM | Global eSIM | Calls & Texts |
Zone A β Roam Free | Calls, texts & data active | Available as backup | β Unlimited |
Zone B β Calls, Texts & Global eSIM Data | Calls & texts active | Data active | β Unlimited |
Zone C β Global eSIM Data Only | Spend Shield protects calls & texts | Data active | π Spend Shield on by default |
Zone D β Limited Global eSIM | Spend Shield protects calls & texts | Data active (1GB/month cap) | π Spend Shield on by default |
Zone E β Coming Soon | β | β | β |
Zone F β Not Supported | β | β | β |
Recommended Settings
Turn this on before you travel and your phone does everything else automatically:
Enable Mobile Data Switching:
iPhone: Settings β Mobile Data β Mobile Data Switching β ON
Android: Settings β Network & Internet β SIMs β Allow Mobile Data Switching β ON
UK Coverage with Both SIMs Active
Even at home, running two SIMs gives you an edge:
πΆ UK SIM on EE β the UK's fastest and most reliable 5G network
πΆ Global eSIM on Vodafone & Three β additional coverage and redundancy (O2 coming soon)
ποΈ 5G across most towns and cities
π WiFi Calling and 4G Calling on compatible devices
FAQs
Q: Do I need to do anything when I land in a new country? No β just make sure Mobile Data Switching is enabled before you travel and your phone handles everything automatically.
Q: Will my UK number work abroad? Yes β your UK number stays active for calls and texts in Zones A and B. In Zones C and D your Spend Shield protects you by default.
Q: What happens if I reach my Global eSIM data limit? Data pauses automatically β no unexpected charges. Contact our team if you need a top-up.
Q: Can I use the Global eSIM in the UK? Yes β it connects to Vodafone and Three (O2 coming soon) giving you additional UK network coverage alongside your main EE line.
Q: Do both SIMs need to be active at the same time? Yes β keep both active for the best experience. Your phone manages all the switching automatically.
Q: What about Zone E and Zone F destinations? Zone E destinations like the Falkland Islands, Cook Islands, and Ascension Island are coming soon. Zone F destinations are not currently supported on any CyberTel plan.
Need Help?
π¬ Live chat: cybertel.uk
π± WhatsApp: click the green button on cybertel.uk
π§ Email: [email protected]
π Call: 0333 038 3852
Available 7 days a week Β· 6amβ10pm UK time