Hello 👋 @Ar7arvi and may I extend a Warm Welcome to the Samsung Community Forum.
Can you try your sim card in another phone and then see what happens.
And if possible another sim card in your phone as a process of elimination.
Try a forced reboot by holding down the volume down key and power button simultaneously for more than 7 seconds to restart it. When your phone resets, you will feel it vibrate.
If you perform a forum search you may find existing threads with some further help or guidence within from people experiencing the same after an update.
You can try Settings > General Management > Reset > Reset Network Settings.
If that does not help try the sim card in the secondary sim slot.
The phone also does have a Diagnostic Tool 🔧 found in your Device Care Section.
Feedback can be sent to Samsung via your Samsung Members App too.
Ultimately a Samsung Service Centre can assess your phone if necessary.
If i can be of any further help please don't hesitate to ask 😎
Daily Driver > Samsung Galaxy s²⁵ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
