Yep, same here, all of a sudden this evening the phone doesn’t recognise the second sim card, just tray 1 and doesn’t even show the option in settings. So I switched the sims around to check if it was the sim tray or network, and the phone only detected a sim in tray 1, not anything in tray 2, and in the settings it doesn't show a dual sim is available because it doesn't detect the second card. The phone stays in its case so is always clean so no dust/dirt issues in the tray slot.. this issue follows on to the recent loss of notification sounds for the media/message/email apps on phone. Via the main settings-notifications-notification sounds, the actual notification isn't played at all, but if I go to settings through the app itself I can hear the notification sound i select, yet when I get an actual pop up notification the phone still doesn't play a sound... yet ringtone and some other google apps work absolutely fine.. I'm sure its because of the last Samsung security patch update i accepted a week ago, someone must have messed up the patch coding because before that everything was fine, but since that day it's had these issues develop, all conveniently now it came to be outside its 2 year warranty. Almost starting to get as bad as apple services...
