I love my iphone.
. I am always amazed that people have them but barely seem to know about any of the features. Why pay so much money for things you don't use 
I am even more amazed that people don't use Siri very much. I know it takes a bit of getting used to but it's so useful. I use it all the time. I have got to the stage of not being embarrassed about it either. 
The other feature I use a lot is Location Based Reminders If I am out and about and remember I need to put the bins out when I get home I ask Siri Remind me when I get home to put the bins out. Then when I get home I get an audible reminder.
Siri will use any address in your contact list. So I can set up reminder for the post office, or work or the supermarket. You can set the reminders to come when you arrive or leave a location.
I now never forget to buy something at the supermarket as I usually get a very long reminder of what to buy when I get there
Here are some recent reminders I have used
remind me when I get to mums to ask about the holiday
Remind me when I get to Asda to buy scouring pads
Remind me when I get home to call the bank
(You can see I lead avery exciting life
)