caller ID
US /ˈkɔːl.ər ˌaɪˈdiː/
UK /ˈkɔːl.ər ˌaɪˈdiː/

1.
Anrufer-ID, Rufnummernanzeige
a telephone service that displays the telephone number of the calling party on the recipient's telephone equipment
:
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My phone has caller ID, so I can see who's calling before I answer.
Mein Telefon hat Anrufer-ID, so kann ich sehen, wer anruft, bevor ich abhebe.
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Some people block their caller ID for privacy reasons.
Manche Leute blockieren ihre Anrufer-ID aus Datenschutzgründen.