You can track your spending more easily if you update the apps on your phone to the destination’s currency. That way, it will be easier for you to check how much money you have left so that there are no surprises when it comes time to pay.
If you’re traveling, it’s a good idea to set your phone to the local currency so that all of your transactions are automatically labeled with their correct prices.
Fiddling around with exchange rates all the time is not worth it!