Why the contacts are suddenly unable to save on my J7 max when i try to save a contact it always shows that unable to save contact. please suggest a suitable resolving technique on this issue and as soon as possible.

The Contacts are saving whatsapp account of different person in different names why ?

I have recently bought a S7 from flipkart and after using it for 3 days only it starts heating, why the phone (s7) heats up so quickly when using the camera please provide me a reasonable solution

please provide this feature or provide an update to install this feature on j7 max of current users or if you want charge for that please charge an optimum amount !!!

please give auto call recording features in the samsung phones.