I want to know what is this symbol meansI am using A30

I am facing heating Issues in A30What ti do??

Guys Please Help me I am normal user. I dont play games I am confuse betwwen A30 and A50. What to buy???? Is there any problem with A50 fingerprint scanner?

I am normal user. I am very confuse between A50 and A30. I heard A50 has issue with fingerprint scanner; it is slow and not working properly. Is it true? And any other issue with those 2 phone- like heating, battery, network, dislay flickring, etc. ...