The mobile phone can alert you of events such as an incoming call or an incoming message in a number of ways. The two most popular ones are vibration and ringing.
While vibration is pretty much self-explanatory, the ringing alerts can be of several types depending on the mobile phone.
In the past mobile phones used to allow only monophonic tones to be set as ringing alerts. With the advancement of technology, polyphonic ringtones also became supported.
Later on as mobile phones further evolved, they started using MP3 tones for various alert purposes. As more (presumably superior) audio formats became available (such as AAC), they were also added to the mobile phones' alert system.
Recently, mobile phones have even started to use short video clips as call alerts (not to be confused with video calls).
No matter what kind of ringing tones the mobile phone uses, users have always enjoyed customizing their ringtones by expanding the preset ones supplied by the manufacturer.
How does Call Alerts work?
Call Alerts will let you know who’s calling even before your phone rings. This allows you to set the phone on silent if you want to ignore it or move to a quieter place if you want to speak.
This works only when a Truecaller user calls you. This uses the data / Wifi to securely send the alert from the caller's phone to yours, as soon as a call is made to you. Since data/Wifi is faster than a regular cellular network, the notification reaches you first, before the actual call comes through.
(Note: This features needs Notifications permission to work. You can disable Call Alerts anytime from the Settings section of the app.)
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