How to check the total talk time of Apple's mobile phone?

Take the iPhone6 as an example, and check the "talk time" as follows:

First, open "Settings" on the phone desktop.

2. Open "Settings", find the column of "Cellular Mobile Network" and click "Enter".

Third, you can check the total "talk time" here, as shown in the figure below.

Four, at the bottom of the page, you can also see the time to start statistics, as shown in the figure below.