How to Activate Developer Options on Locked Devices Using Secret Codes : - Samsung : *#0*# or *#*#88#*#* - Huawei : *#*#2846579#*#* - Xiaomi : *#*#6484#*#* - Vivo : *#*#225#*#* - Oppo : *#899# - Infinix : *#*#49#*#* or *#85# - Tecno : *#*#49#*#* or *#85# - Alcatel : *#2886# - Lenovo : *#*#4636#*#* - Sony : *#*#737378423#*#* - Motorola : *#*#2486#*#* - Honor : *#*#2345#*#* - OnePlus : *#*#2346579#*#*