OBDScope is a vehicle On-Board diagnostics software for S60 smartphones (3rd and 5th editions). It can be used with an ELM chip based Bluetooth OBD adapter. This is a hobby project and the software is freeware.
Free Download: OBDScope_0.1.2_unsigned.sis
(This is unsigned version. It needs to be signed before installing. Signing can be done e.g. at www.symbiansigned.com)