Interestingly, if you go into photos and then places you will see that (if you have location services turned on) that your iPhone has geotagged the locations of which you have taken pictures with your phone.

ah but does it tell you where you went on Friday?

No, it would if I had taken pictures!!

Still no idea what happened on Friday.

More to the point, do you want it to show where you were on Friday

I wish it could show me what I did on Friday. I have flash memories which I kinda wish I wasn't haha.