Caller ID

modulation scheme for transmissions

service that sends phone caller's number to the recipient of the phone call

Truecaller is a smartphone application that has features of caller ID, call-blocking, flash-messaging, call-recording (on Android up to version 8), chat and voice by using the Internet. It requires users to provide a standard cellular mobile number for registering with the service. The app is available for Android and iOS.

Whoscall is a mobile application that offers caller identification services developed by Gogolook Co., Ltd., a listed company in Taiwan.

phone caller faking the phone number sent to the recipient of a phone call