iPhone Call problem Voice not audible

Bro last 2-3 months a call panna ring and voice keka matanguthu
Oru 2-3 times cut panni pota kekuthu
I am using iphone 11 2 years ago
Sim is vodafone
What to do ?

hi bro, network issue unga area la irukanu once check pannunga. old sim card use pannureenga appdina, vodafone showroom visit pannitu new sim card for same number vangitu check pannunga. that will help too.

iOS side la problem iruntha “settings - general - reset - reset network settings” la fix aagumnga. otherwise above steps will help bro.