Como obter o código IMEI gratuitamente em dispositivos LG

LG G7120 LG G7120
LG G7200 LG G7200
LG T5100 LG T5100
LG G1600 LG G1600
LG C1100 LG C1100
LG C1200 LG C1200
LG C1400 LG C1400
LG L1100 LG L1100
LG G3100 LG G3100
LG C3100 LG C3100
LG L3100 LG L3100
LG F2100 LG F2100
LG F2300 LG F2300
LG G1700 LG G1700
LG G1610 LG G1610
LG G1800 LG G1800
LG C2100 LG C2100
LG C2200 LG C2200
LG L5100 LG L5100
LG A7150 LG A7150