I managed to create a phone-only contact which was then linked to the contact's Facebook account. I've also got a Google contact for the same person which has additional contact information in it.
I'd like to merge the contacts so that I only have one entry for this person but with the combined information. I don't want to have to copy the information manually between the accounts.
The phone is running Android version 2.3.7 and it's the contacts manager that came with the phone.
I've checked the similar questions, bit none seems to address my specific issue.