Hi is anybody here can help me to fix my phone. Why my phone is experiencing emergency calls only when my screen lock is on.
This could be your network provider or the sim card is failing.
As a process of elimination can you try your sim card in another phone and then see what happens.
When you unlock your phone does your phone make and take calls Ok ?
Try a soft reboot by turning the phone off and on.
A Samsung Experience Store / Samsung Service Centre can run a diagnostic too.
Current Phone ~Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+ Samsung One Ui 3.1/ Android 11.