I am using samsung a52 4g but i am facing a network issue when i connects to the internet why i am facing this issue i got very low internet as well as worst connectivity but at the same time other phone get good connectivity is it a setting problem ...

When i make a call on the phone speaker then i not be audible to the other caller over the call but if i off my speaker then automatically i audible to the other caller in my samsung galaxy a52

My password is not saving in samsung pass. i also changed my setting but it doesn't work . What i can do 

Can company change my phone if my phone is in guarranty.

On my back panel some patch are present i dont know how is it happen can i change my smartphone because my phone is in guarranty of 1 year