iPhone 15 plus network issue after iOS 26.3 update

I am facing a signal network issue on my iphone 15 plus. I recently updated my phone to ios 26.3, Is that a bug from ios 26.3. Whatsapp call and instagram call disconnects often due to this issue. It will be helpful if you could suggest a fix for this issue ?

hi bro, this could be temporary coverage issue in your area. most of the networks jio, airtel are experiencing such network issues and congestion in many cities. give 3 to 4 days time you will notice improvement.

if issue continues, perform settings - general - reset - reset network settings once and see.