When you’re traveling abroad, staying connected is essential, whether it’s for checking maps, messaging loved ones, or sharing Instagram-worthy moments. But how does your mobile network operator (MNO) make this happen without requiring you to switch SIM cards or purchase a local plan in every country?

Let us introduce you to International Roaming, a seamless service that allows you to stay connected wherever you are, thanks to a global web of partnerships between MNOs.

Here’s how it works: When you travel to another country, your domestic MNO “borrows” the network infrastructure of an operator in your destination. This collaboration ensures you can access cellular services—like calls, texts, and data—without changing your SIM card.

It’s a behind-the-scenes handshake between network operators, and the result is smooth connectivity for you. However, before International Roaming can function reliably, rigorous testing needs to be conducted.
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This systematic approach—testing across multiple countries and phases—highlights the effort required to ensure customers can stay connected effortlessly, whether they’re sipping espresso in Rome or taking selfies at the Eiffel Tower.

First phase: Madrid, Spain — the Trial Phase. In this phase, there are several tests that can be carried out or not, therefore the test cases are modified to be more effective and optimal for evaluation.
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The second and third phases are the Implementation Phase. The second phase includes five countries, namely Austria, France, Italy, Switzerland, and the UK. In these five countries, all predetermined test cases were carried out and several successful results were obtained, as well as results that need to be evaluated deeper. Of course, MNO collaborates with relevant vendors to be able to solve the problem.
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In the third phase, which took place in Belgium and the Netherlands, the test cases carried out were the same as the second phase and it can be concluded that several results have been reviewed and under review.