Battery drain phone 'audio' ??

[carltabs]

My iPhone 7 battery useage is peculiar. Under settings and battery useage phone is listed. However it says phone 'audio'. I have made a 2 minute call all day and it has used 35% of my battery?
Does anybody know what phone 'audio' actually relates to ?
Thank you, Carl

https://www.dropbox.com/s/az1ekkiydx8iomc/IPHONE 7.png?dl=0

 

[stayawayfromthey]

Did you make a call yesterday?

 

[carltabs]

Hi just one two minute call