IPA: /ˈdaɪlər/
KK: /ˈdaɪlər/
A person or device that makes phone calls by dialing numbers.
He used the dialer to call his friend.
Dialer → It is formed from "dial" (from Old French *dialer*, meaning to mark or indicate) and "-er" (meaning a person who). A dialer is a person or device that marks or indicates a number to make a call.
Think of someone who 'marks' or 'indicates' a number to call — that's what a dialer does.