How to get rid of this

In my Samsung Galaxy F62, there is having some serious network issue in my phone. Network reception became so poor now and data connection is worst. I can't even use whatsapp because of this network issue. And I found out, I'm not the only one who's ...

Facing n/w issue in f62 on sim2 when phone in standby mode call is not getting connected and max time getting sms of missed call due to n/w issue