If you move frequently between cities, the Prayer Times app let you add prayer times for several locations.
1. Go to the home page, tap Plus and follow the same steps as adding a city.
2. When this is done, you can easily view the calendar for all the cities you’ve added in the app simply by swiping right and left.
Related articles:
Why can't I find a city?
How to add a city?
How to change a city?
How to remove a city?
How to change the default city?