Smart Piano is a (hopefully) fun app for Windows Smartphone 2003. Press a key and it will make a piano sound, it's that easy.

You'll need 1.7Mb free on your phone or storage card. Pressing and holding a key will keep the on-screen notation displayed.

There is a one octave range and on screen notation. I believe it will take up a fair bit of memory and there is a small bug: the very first keypress after the app loads doesn't display the notation, but it's all fine after that (I'll get round to sorting that after I've looked into the feasibility of doing some sort of MIDI player). Everything else seems to work on my phone but, as always, use at your own risk.

Keys:

Up: C Major Chord
Right: G Major Chord
Left: F Major Chord
Down: Middle C
1: C sharp
2: D
3: D sharp
4: E
5: F
6: F sharp
7: G
8: G sharp
9: A
*: B flat
0: B
#: C
Volume: Phone volume buttons