How to track a phone by phone number?

You can track a phone by phone number using the following ways:
– Informational websites: these are simple databases with information about phone numbers and their owners;
– Spyware: with a phone number or without it, it tracks the very GPS location of the phone;
– Social networks as search engines, type the number in the bar and wait for the account attached to the number;
– Search engines as a way to track a phone number for free.