When i try and attach a display image to a contact in the address book it
sometimes comes up with the message "Unable to attach image".

This only happens on some contacts.  The images are .jpg.

Other contacts let the images attach ok and the jpg files are all
compressed/saved in the same way.

I've tried deleting the contact and remaking it and resetting the phone with
no luck.

The phone is a Nokia 6280 on 3 network (if that makes a difference).

Any ideas?