Yes, I have used SH813, SH833 and SH313. Both 813 and 833 is too big but the lens is good. can replace DC. But the ring tone volumn is too low can not hear if walking on the street.
For SX813, if you use your own MP3 as ringtone, the sound can be louder but you need some procedures to make your phone to choose you own download MP3 as ringtone. Cause Sharp only support DRM copy right file as ringtone