The phone is wrong
(I'm getting nerdy for a meme, don't judge)
According to PEMDAS, Parenthesis goes first, which would turn the 2+1 into 3
6÷2(3)
You then multiply the 2 and 3, turning it into 6
Now you have 6÷6
A number divided by itself can only equal 1
Therefore,
CASIO wins, 6÷2(2+1)=1
I have now done my daily civic service to society
Your Welcom