Does this happen everywhere you go or in a particular area ?
Is this happening with all your contacts or a select few ?
As a process of elimination can you try your sim card in another phone to help rule out the sim card kr phone.
Can you try another sim card in your phone and then see what happens ?
Is it possible the issue can lie with the other person or network cell masts !
You can run a diagnostic via the Samsung Members App diagnostic tool and also try a network reset in your phone's settings.
A Samsung Service Centre can check out your phone too.
I wish you all the best. Take care. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.