If you're looking for a competent scientific calculator for your Symbian Smartphone, why not try one that not only offers the exact same functions as stand alone calculators, it also offers the same look and setup of one. In this case the Casio FX-602P Scientific Calculator.
The FX-602P is a calculator simulator, which means that it offers the same functions as found on the original stand alone device. In this case the looks are dead on for the Casio version of the calculator.
One of my biggest qualms with the unit is that it's a little bit crowded with all the keys displaying on the smaller screen size of my Symbian device. The keys were rather small when it came to pressing them on the Nokia N97 and on a Samsung Omia (I only got to play with it for a few minutes on a friends Omnia). Although they are easy to read with both devices bright displays.
Where this app really shines is the ability to perform many various tasks at one time. For example, I was able to perform basic calculations, scientific calculations, statistical functions, checking and editing functions and many other options right from the same screen I was already staring at.
Because the layout is setup to handle many different type of functions it comes across as crowded but also very functional for switching between calculation types.
I also liked the ability to "pause" an application from within the application. This is a great option if you're an engineer or even if you're working on homework and you get stuck on how to complete a question and you need to call a classmate or wait until later to finish the question.
Admittedly I'm not a mathematician, so some of the programs functions may have been lost on me, however I do remember my college math classes and the ability to program function, save functions currently in use and take advantage of a touchscreen (even if crowded) makes this an application worth having a look at.
With that being said the $13.95 cost from Handango may be a little steep considering there are mobile optimized calculators available that are not as crowded on the users screen and work just as well.
If you like apps that feel like real world devices this may be the app for you, however if you need just a simple scientific calculator you may end up with more than you bargain for.