Trick 11: Wanna Know who's Phone number is it? on February 24, 2014 Get link Facebook X Pinterest Email Other Apps You must read this post, If you wanna know any phone number's owner, without calling him. Truecaller is the best Android application and best website to know the phone numbers. This website and the app works on the availability of the numbers, which are in the phone that uses this App. Really awesome app and you need to try it.