Hello friends this truecaller app is not good, if you install this application in your mobile. It will fetch all your personal details like your contacts and your friends contacts with brief detail.
There are many rumours that, this application will leak your valuable information.
If someone wants your information like photo, Address and other details and you logged in with Truecaller and filled up with all the information. This causes miscellaneous attacks to retrive your data. So please be away from this kind of apps.