How can I track a mobile phone everywhere in the world?

I read that it is possible to track a mobile phone. I visited the website PhoneTrace and don't really know if it works, I tested it but the screen stuck on loading. I want to know if the PhoneTrace works or if there is a free alternative?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).