This tutorial is about the steps required for adding an additional clock on iPhone 4S. Let us say you are travelling to a different country and would like to have the clock for that city along with your home country city.
Step 1: Press the menu button on iPhone 4S and tap the clock the icon.
Step 2: Navigate to World Clock tab and tap the + icon on the top right corner to add clock for another country.
Step 3: Now enter the name of the City example :- London and select the city from the drop down. This should add the clock for London as shown below
How to Remove Clock.
iPhone 4S users can remove the clock by tapping on the Edit button. This would show the action icon before the clocks.
Tap the action icon would display the option to delete the clock from Word Clock list.