The IMEI (International Mobile Equipment Identity) number is the unique code that identifies your phone. You’ll need it if you contact support regarding a warranty, and it’s important to have if your phone is stolen.
Service providers can use the IMEI to block a stolen phone from cellular networks, and many police departments keep a record of stolen phones using this number.
You may never need your IMEI number, but it’s a good idea to record it, just in case.
To find the IMEI number: