Your phone automatically connects to the strongest available mobile network. When you're abroad or near a border, it may also connect to a network from a different country, where different roaming charges apply. By manually selecting a network, you can choose which operator your phone connects to and avoid unexpected charges.
If your phone displays the name of a mobile operator from a country other than the one you're currently in, services may be charged according to a different roaming zone. The most common situations include:
By default, your phone is set to automatically select a mobile network. When travelling abroad, it searches for available networks and connects to one of them automatically. It may also switch to another network if it detects a stronger signal. If you want full control over which network your phone uses, you can enable manual network selection. The exact steps vary depending on your device, but the process is usually similar to the examples below.
Settings > Mobile Service > select the SIM (if you use multiple SIM cards) > Network Selection > Turn off Automatic.
Settings > Connections > Mobile Networks > Network Operators > Turn off Select Automatically.