Esdiac Data

On iOS 14 and later, Open Settings, then select General and finally About.
If you see “No SIM Restrictions” in the Carrier Lock section, your device is unlocked.
If your device is currently locked to a specific carrier, you can contact your mobile phone provider to check if it can be unlocked.
Devices purchased directly from Apple and not through a carrier’s promotion will be unlocked.
If you have remaining payments on the device to your carrier (e.g. T-Mobile) you will not be able to get your device unlocked until it is paid in full to the carrier.

Access Settings from the drop-down menu or through your App Drawer.
Tap on Connections, Network & Internet, or other variations depending on brand and model.
Select Mobile network, Cellular network, or other variation depending on brand and model.
Tap on Advanced (if needed) and select Choose Network, Automatically select network, or another variant to open the list of carriers.
If several carriers appear, the chances are that your phone is unlocked and just needs the appropriate SIM card. For further confirmation, continue to Step 6.
Remove the old SIM card from your phone and insert the newly activated one from the other carrier. Try using mobile data to browse the internet but ensure that Wi-Fi is disabled.
If you successfully browsed the internet, your phone is definitely unlocked.
Aside from inserting a valid SIM card, you can try calling the current carrier to confirm the locked/unlocked status.