It seems ok for my device (5800)
But, It says "Device incompatible" in installation process and not found any special icon after installation.
nyway, further testing required..
Good Luck ...
had the same message on install but since then no problems, runs just fine.
As the rest of the phone the app picks up what u write very well, just seem to have a few issues with the number 5!
have sent many examples back in, hope this helps!
One thought though, sometimes while writing longer numbers if you need to go underneath the first number then you want to ad/subtract etc it will not pick this up as part of the sum... maybe something to lok at.