How to check the duration of phone calls on the iPhone 4s?

How to check the duration of phone calls on the iPhone 4s?

On the home screen/menu press the cream icon with the white phone. On there there will be choices along the bottom (from L-R Favourites, Recents, Contacts, Keypad, Voicemail). Click on the recents and it will have a log of all phone calls you have made. Next to the time the call was made, there's a little i icon in a circle, if you click on that it will tell you how long the phone call lasted. Although that would have been difficult to keep up with I hope you understood it and I helped.

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