I use Diaconnect to keep records on my iPad.. (Just like a big iPhone.)
I use the free version. Good enough for BS, dosage, carb count.. You can add notes, icons like sick days.
It will even work out an HbA1c for you so you know what to roughly expect down the docs...?
No problem.. There are other apps about. (Which I've looked at.) plenty of threads with reviews on em too..
I like the layout of the Diaconnect. If you remember the days of pee testing in a mobile chemistry lab? You will know what I mean.. With the colour scheme on the Diaconnect. Lol