Data Roaming Demystified: How It Works and How to Control It

You find yourself in a new city, feeling both tired and happy. You check your phone, and it says "No Service." You turn off aeroplane mode, and suddenly, your phone gets a signal from some network you don't know.

When checking your banking app several days later, you'll realize your roaming bill is through the roof. This is not a rare accident; in fact, this is the basic experience of people travelling while roaming.

The troubles pile up quickly: you lose 2FA verification messages due to the silence of the home number, you connect to a bad public network in the airport, you keep replacing the SIM in your cramped space, and you get locked into a contract you did not sign up for in the first place. You will be surprised, but you can avoid data roaming problems. Here’s how to deal with it.

What is Data Roaming?

Data roaming occurs when your mobile handset connects to a foreign network that lies beyond your carrier's coverage area. In this situation, your phone seeks available networks, connects with the provider of the local network through your SIM chip, and begins sending and receiving data, phone calls, and texts via the network provider located in the foreign country. Your carrier then charges you for each megabyte, minute, and text message, usually at inflated rates that could be as much as several times your normal rates.

Why the charges spiral: Removed caps on foreign carriers' tariffs: Foreign companies determine wholesale tariffs on their own, and you, in turn, receive charges for their services from your local carrier. You can actually pay up to ten times more than the average price in your country without realizing it.

Data leaks in the background: Even in the case where the device is switched to aeroplane mode, applications may access the mobile Internet without restrictions. One family was famously charged a huge amount of money when ads in one of the games started sending data abroad.

The issue of changing physical SIM cards: Changing plastic cards while abroad means losing your phone number. You stop receiving two-step codes and texts from your bank, which could cause serious problems. Plus, losing the SIM card means you no longer have access to your primary phone number.

Limited services on other networks: Daily roaming passes seem to be a good option, but they also come with various additional limits and need to be cancelled manually after they are activated.

If you're travelling to the UK, you can avoid unexpected roaming costs by using a eSIM UK for your mobile data. It lets you stay connected while using maps, Travel eSIM apps, messaging, and other online services without relying on your home carrier's roaming rates.