Contacts deleted during a phone call

Beg pardon if this is a stupid question but I’m a newbie to smartphones: Just got a phone call while editing a contact’s number. I took the call, thinking no evil. While we were talking, the phone vibrated a couple of times. I ignored that, being a newbie. When I hung up, all contacts were gone! The contacts app is still there but I’m the only person it shows. Is there any way on earth I can get back my contact list? The important ones were all stored on the SIM card. - PS just inserted the card into the old phone and they’re all still there… so I just have to get them back on the phone. Will check the relevant forum topic!

Solved! Sorry for the unnecessary question.

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Could you please tell us what the solution was?