To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

You can check if your device is locked through the IMEI information, or by switching out the SIM card, or by checking via the device's mobile settings.

Cybercriminals are targeting mobile users through SIM swap fraud. They trick operators to transfer numbers. This gives them access to sensitive accounts. Users should strengthen account security.

Carriers often sell locked phones, restricting them to their SIM cards. If you have a device from another carrier, it must be unlocked to connect to the T-Mobile network.