duplicates in phone contacts
Hi
My iPhone has duplicate entries for a lot (not all) of my contacts. My MacBook only has one entry per person, as does iCloud.
When I delete one of the duplicates on the iPhone, the entry on my MacBook disappears, and then the remaining entry on the iPhone disappears too, but the entry in iCloud remains, however, I can't edit it.
What is going on?
How can I tidy up the contacts on my iPhone without corrupting my Contacts?
TIA.
iPhone 11