I have a C75 with 10.2 Mb, but some used in useless (for me) pictures, applications etc; obviously the great part is erasable by the user, but some are just visible on the desktop with the phone explorer program. Try, for example, delete all then T9 file you don’t use …
Also, using the Open Disk, u can replace the default theme inserted by the operator (eg. on my phone, T-Mobile stuffed the memori with huge 1meg theme, plus some stupid ringtones - useles)
after using OD, the default theme & tones re under Config/Default folder
I managed to delete almost everything I did not want, inclusive the Photo Editor, nice program, but not useful for me. The Photo Editor was marked ‘read only’, but if you try to change its name (will receive a negative answer) and after that use the internal Memory Manager, enter the Applications option and select Erase All, it works nicely.