We can locate any device with the help of IMEI Number. How to do that? How to protect our Imei number soo nobody can locate us.

Answer 1

if you're paranoid about being located remove the battery from your phone or simply do not carry any phone with you.

Answer 2

If you're going to be tracked, chances are that it'd be due to a Trojan virus on your device that connects to a remote host. If it's not done that way, then you'd likely be tracked by your MAC address (less effective). For mobile devices, the IP tends to be dynamic, so you wouldn't have to worry about that after a while.