Seems that it has faster CPU and more memory (ROM and RAM) and slightly different apps pre-installed.
i've got this phone and i know it's faster than normal c3 01, but i was wondering about all specifications about that phone. but even nokia sites haven't got something about this model.
as it is mentioned in the link I gave, it seems this is actually the same model i.e. C3-01. They have just for some reason changed the CPU and RAM/ROM amounts. If it would be its own model it would have got its own pages on Nokia site, like c3-01 gold ed has
1 GHz processor, 256 MB of ROM memory, 128 MB of RAM memory, Nokia Browser and Series 40 Web Apps support comes with the device firmware by default.
680 MHz processor, 128 MB of ROM memory, 64 MB of RAM memory, WebKit Open Source Browser as the default web browser (Nokia Browser is available as a downloadable addon from Nokia Store).
Otherwise C3-01.5 is identical to C3-01
Seems that X3-02 has upgraded X3-02.5 version with same differencies as well.
Perhaps Nokia got a bargain deal of 1Ghz CPU as these are poping up in all S40 phones nowadays (X3-02.5, C3-01.5, Asha 300 and 303)
Has anyone been able to compare the .5 to the orginal i.e. how much faster is the phone