Some times Samsung galaxy a71 Receiver and speaking sensor not works ,when someone call me Give the powerfull solution 

I'm using Samsung galaxy a71, The same Galaxy a71 Mabile has network problem How to solve this problem , reply the solution. 

When u record in Samsung Galaxy screen recorder ,it is not recording screen it records only blank green screen ,what is the problem please give me a solution for this This is the blank picture recorder by screen recorder Please give me a solution for...

how to play songs in Samsung music during call is going on. give me solution