How can I know the busy phone call from my smartphone?

A. 1

You need to sign up for the service from the carrier.
You can register by pressing 114 and contacting the customer service center.

Gentleman 9 years ago 0

OK

A. 2

Incoming call verification is an add-on service.
Each carrier has a different name, but SK Telecom calls it a goalkeeper and KT Olle calls it a catch call.
When you sign up, if you receive a call while on the phone, you will be notified by text message that you have received a call.
Or even if your phone is turned off, you can turn it on and text it to tell you where and how many calls came from.
To sign up, you can call the carrier's customer center 114 and apply for registration.

Gentleman 9 years ago 0

OK