zlacker

>>rafael+(OP)
I clicked hoping this would be about how old graphing calculators are generally better math companions than a phone.

The best way to do math on my phone I know of is the HP Prime emulator.

>>Button+dg
My personal favorite is iHP48 (previously I used m48+ before it died) running an HP 48GX with metakernal installed as I used through college. Still just so intuitive and fast to me.

>>xoa+mC
I still have mine. Never use it though as I'm not handy with RPN anymore. :'(