my galaxy A 51 got updated.....and right after the update my sim is not working....the phone is not detecting the sim card even if the sim is in the phone.....so, as my suggestion kindle don't update your phone.thank you

yeah...the same problem with me alsoafter an recent update to android 12 my sim was out of my reach....it's showing that your sim is not registered and it's detecting....even after resetting the phone again it's not working.