There is actually no known way to scan a s40 mobile( thats what i know) but i have found a tricky way to do this..

Actually s40 phones dont support .sis

so you have no .sis programs for your s40 mobile

But with this trick you can easily clean the unwanted particles roaming in the phones memory..

First of all , switch off the phone.. Now, take out the Memory card, and switch the phone on without Memory card..
Now, you should connect your phone with the help of Nokia pc suite..go to my computer and inside phone, you will see many 0 kb files...

IMPORTANT:- DONT DO ANYTHING WITH IMPORTANT FILENAMES LIKE NOKIA NK PLAY PLAYER AUDIO AUD VID VIDEO 3GP etc etc ..

you can easily know which are those files which are creating the problems, by just checking their names.. Unknown name delete it, and it must be a 0kb file...

Than when you are done.. come out and fix the memory card in the slot and there you go!!!

p.s :- Its just a trick, i cant take responsibilties for any damage caused by it..