We have all felt that surprise waking up in the morning and our phone suddenly has a new system update or operating system, which is wonderful.
But what the phone sometimes does after that is revert back to some settings, like the Phone app or SMS app. No worries, it's easy to revert with a few simple steps.
Steps to make it default again:
- Open your Truecaller settings
- Go to Caller ID
- Set Truecaller as your default dialer. (Please refer to the screenshots below):

Tutorial Video: