Welcome to Vodafone Community
Probably only by answering will you find out who the incoming caller is @Andreea1
I appreciate for some that maybe a daunting option as some don't like answering calls from unknown incoming calls.
Some can be from Dr's surgeries etc.
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui 2.1 / Android 10.
Samsung Gear s3 Frontier Watch.
Samsung Galaxy Buds.
It won't be possible to find the identity for withheld or private numbers, numbers are very often spoofed and don't show the real number. These calls very often originate from telemarketers, spammers or scams.
Depending on the Vodafone service you are using, please see below.
If you are using a mobile service and want to stop these nuisance calls the best suggestion is to download an app. If you are using Android a good one that comes up with some good reviews is here: Google Play Store - Should I answer
For Vodafone home phone there is Anonymous Caller Rejection follow this link: Your Guide to Home Phone
Also further information here: Nuisance Calls
The best suggestion is to never answer a withheld or private number, if it is a genuine call, they will get the message and call back.