I use the reminder for everything.... if the data and date I need is not in the mobile than It doesnt exist. Hell I even use the clock alarm when Im cookiing... if the recipe says 15 minutes, I put it on and set the timer to remind me.
I put on the memo program all my grocery shopping items I need to buy.... and delete them from the mobile in the shop as I load that item into the cart. I save Birthdays, Doctor appointments, Social engagements, reoccurring requirements for my dog's well-being (like worming, flea medicine) and bills are due.
Like I said.... if its not listed in my phone than it doesnt exist.