Como obter o código IMEI gratuitamente em dispositivos Doogee

Doogee X10 Doogee X10
Doogee Mix Doogee Mix
Doogee X30 Doogee X30
Doogee BL5000 Doogee BL5000
Doogee X20 Doogee X20
Doogee X20L Doogee X20L
Doogee X30L Doogee X30L
Doogee S60 Doogee S60
Doogee BL7000 Doogee BL7000
Doogee S30 Doogee S30
Doogee Mix Lite Doogee Mix Lite
Doogee Mix 2 Doogee Mix 2
Doogee BL12000 Doogee BL12000
Doogee BL12000 Pro Doogee BL12000 Pro
Doogee S50 Doogee S50
Doogee X60L Doogee X60L
Doogee X53 Doogee X53
Doogee X55 Doogee X55
Doogee S60 Lite Doogee S60 Lite
Doogee X50 Doogee X50