A robocall is a call that delivers pre-recorded messages through auto-dialing software to millions of people each day. If you answer your phone and hear a recorded message instead of a real person speaking, you are listening to a robocall.
Some robocalls provide useful information, such as appointment reminders or flight cancellations. Mostly, though, they are trying to sell you something, and many of them are scams.
Billions of robocalls are made each month worldwide, and they are widely seen as a nuisance. Technology makes it cheap and easy for telemarketers and scammers to make robocalls over the internet, which is why they are so prevalent.
If you receive a spam robocall, the best thing to do is not answer. If you answer the call, your number is considered 'good' by the scammers, even if you don't necessarily fall for the scam. They will try again because they know someone on the other side is a potential victim of fraud. The less you answer, the fewer robocalls you will receive.
How to Block Robocalls in iphone
For those wondering how to block spam calls on iPhone, iOS devices enable you to prevent specific numbers from contacting you, or, if you prefer, you can forward all calls from unfamiliar contacts directly to voicemail.
To block a number on your iPhone:
Go to the Phone app and tap “Recents”
Locate the number you would like to block
Tap the blue “i” inside a circle to the right of the number
On the next screen, scroll down and tap on “Block this caller”
Tap on the option “Block contact” on the message which pops up
To make yourself unavailable to all numbers which are not on your Contacts list:
Go to “Settings” and select the option “Phone”
Scroll down
Tap the "Silence Unknown Callers" switch, so it displays as green
How to Block Robocalls in Android.
The process to follow to block spam calls on Android is similar to the one you use for iPhone.
To block a number on your Android device:
Open the Phone app from the home screen
Locate the tab “Recent” and tap on it
Find the number you want to block, tap on it, and then tap the “i” in a circle
Locate the “Block” button and confirm by hitting “Block” in the pop-up message
To block unknown numbers on your Android device:
Open the Phone app from the home screen
Locate three dots and tap on them to open a drop-down menu
Select “Settings” from the list
Tap on “Block Numbers”
Toggle the “Block Unknown Callers” switch to green
Resource: kaspersky
The Tech Platform