My device settings are configured to AT&T even though it's not an AT&T device
I own Samsung S10 plus which is a direct unlocked device from a different carrier.I have inserted the AT&T sim card as my first sim card to check the unlock functionality and then everything has changed. My device settings are now by default configured to AT&T. I am able to use a different carrier sim but not receiving any OTA updates. Even my device shows AT&T logo when I turn off/On the device. Can someone please help how to reconfigure these settings to normal?