Adding commas to stored telephone numbers in your contacts act as pauses which allow you to navigate complicated phone menus.
For instance, if a phone number requires that you select
1 for English then you can simply save their number as follows
+65 9876 5432,1 to your contacts. Now when you dial that number it will pause and then dial
1 for you. If you require a prolonged pause then simply add more commas, like so
+65 9876 5432,,,1