How to extract the 15 digit IMEI from 21 digit IMEISV?

These numbers includes information on the origin, model, and serial number of the device The structure of the IMEISV is specified in 3GPP TS The model

40 1 Composition of IMEI p 40 The International Mobile station Equipment Identity (

imei slot 1 and 2 1 A! Bsk ataras — — BP Km* Cole [Car — Marie — HI BABY— Bo rt*er 28 PEPPERMINT TV •!umbij>— Jwl Music 28 •! Ro» ofumbuv— C — imei SV -B »bby R : (GCh

imei slot 2 The 15-digit number is guaranteed to be globally unique, meaning dual SIM devices have two IMEI numbers due to their two SIM card slots