iPhone. Dublets in Contacts after using foreign SIM card
On my holiday in Thailand I bought a dtac SIM card so I could use my phone to a low price.
BUT many of the contacts was suddenly in dublets. It seems to be the contacts I have made long time ago. No change after installed my original SIM card and restarted my iPhone. And via iCloud the same problem on my iPad Pro.
If I delete a contact, its double disappear too, so they are somehow linked.
Any suggestions to solve this problem ?
iPhone 7, iOS 15