Why does the Xiaomi 15T still incur roaming charges even after the data roaming option is turned off?

Question

Accepted Answer

Even if the data roaming option is turned off on your Xiaomi 15T, roaming charges can still occur due to certain app behaviors or carrier policies.
For your reference, here is the detailed information for the roaming charges:
1. Some apps, such as messaging apps, email, or cloud services, can use background data when connected to a roaming network.
2. Additionally, some carriers can classify signaling traffic, MMS messages, or Wi-Fi-assisted services as roaming, which can generate charges.
3. To minimize unexpected fees, it is recommended that you manually select a local network when traveling abroad. Checking your carrier’s roaming policies and monitoring data usage can help prevent unintentional roaming charges.