How to track lost mobile using IMEI

We can’t do that (Find my phone is the only option)

Check this thread : Mobile Stolen

If your friend still has box then IMEl has mentioned at the back and a slip with barcodes inside the box. If the mobile is purchased from offline retailers then they sometimes add the IMEI number on the bill. 

No bro, it’s not possible to track your lost phone by your own. Only police can do that with the help of network provider but as we know 99% cases police don’t even care to put any any effort to search your phone. For safety reasons, you should report to police & get FIR copy so that if somebody misuse the phone you will have proof to show. Only you can hope whoever finds your friend’s phone, he/she contact your friend return the phone. Aise log boht km hote hai jo apka possessions ko return krde.