Dual SIM in the UK: How to receive calls from home while using an eSIM for local internet

One of the biggest dilemmas for tourists traveling to the United Kingdom is how to remain available on their usual number without paying huge roaming fees for internet access. Many fear that, if they install a data eSIM, their family or bank will no longer be able to call them on their usual number. Dual SIM technology solves this exact problem, allowing you to use two lines simultaneously on the same phone.

Here’s how this system works and how you can configure everything to have zero internet costs while staying connected with those back home.

How the two lines work in parallel

Modern phones can manage a physical SIM card and an eSIM profile at the same time. This means you do not have to remove your regular SIM card from the phone. It remains active for voice calls and SMS messages, while the new eSIM eSIModo takes over the task of providing the high-speed internet needed for your vacation.

The system is smart: in your phone’s settings, you can decide exactly what each line does. You can set your regular line as the primary one for “Voice” and the eSIM as the main source for “Mobile Data.” This way, the phone will know to use the local British network for maps or Instagram, while keeping your home line open to receive important calls.

Essential settings to avoid unwanted costs

The biggest mistake you can make is to leave “Data Roaming” enabled on your regular SIM card. As soon as you land in London, make sure this option is disabled for your primary SIM and enabled only for the local eSIM. This protects you from shock bills, because the phone will not use a single kilobyte through your home operator.

You will be able to see two signal bars at the top of the screen. One belongs to your usual network, while the other belongs to the 5G network in the United Kingdom. Here’s why this configuration is the most logical choice for any traveler:

• You receive confirmation SMS messages from your bank, which are usually free while roaming.
• You can be reached in an emergency on the number everyone knows.
• You use the internet at local prices, without depending on the hotel’s Wi-Fi.

Managing calls and messages on WhatsApp

It is important to know that your WhatsApp will remain configured with your regular number, even if the internet connection comes from a British eSIM. The app only needs an active internet connection to work. So, you will be able to chat or make video calls with friends just as if you were at home, using the fast, affordable data included in your eSIModo package.

If you receive a regular call on your usual number while you are in the UK, the phone will alert you which line is being called. You can choose to reject the call and call back on WhatsApp, thereby saving your international roaming minutes. This flexibility is why eSIM technology has become the standard for modern vacations.

The advantage of no longer having to change SIM cards physically

Before eSIM technology appeared, you had to use a metal pin, remove your home SIM card, and insert an English one. The risk of losing your primary SIM card or damaging the phone tray was high. In addition, while you had the English SIM card in your phone, you were completely disconnected from your usual number. You could not receive any messages or urgent calls.

With an eSIM, everything is digital and much simpler. You activate the data package by scanning a QR code and have both worlds at your disposal. It is the most efficient way to travel: you get all the internet you need to explore the United Kingdom while remaining just as accessible to those back home as if you had never left.