For those with Nokia 3 here are some secret code you can use to perform some advance functions on your smartphone without rooting your device.

*#*#3646633#*#* - Enter in engineering menu

*#0000# - Get the SW Version (e.g. V 5.27.0 / 28-06-04 / NHL-10 )

*#2820# - Get the Bluetooth (BT) Device Address

xx# - Quick contact access (xx = location number, e.g. : 17#)

*#62209526# - Get the MAC address of the WLAN adapter

*#301279# - HSDPA/HSDPA Control Menu

*#7465625# - View phone lock status

*7465625*638*Code# = Enables Network lock

#7465625*638*Code# = Disables Network lock

*7465625*782*Code# = Enables Subset lock

#7465625*782*Code# = Disables Subset lock

*7465625*77*Code# = Enables SP lock

#7465625*77*Code# = Disables SP lock

*7465625*27*Code# = Enables CP lock

#7465625*27*Code# = Disables CP lock

*7465625*746*Code# = Enables SIM lock

#7465625*746*Code# = Disables SIM lock

*7465625*228# = Activa lock ON

#7465625*228# = Activa lock OFF

*7465625*28638# = Auto Network lock ON

#7465625*28638# = Auto Network lock OFF

*7465625*28782# = Auto subset lock ON

#7465625*28782# = Auto subset lock OFF

*7465625*2877# = Auto SP lock ON

#7465625*2877# = Auto SP lock OFF

*7465625*2827# = Auto CP lock ON

#7465625*2827# = Auto CP lock OFF

*7465625*28746# = Auto SIM lock ON

#7465625*28746# = Auto SIM lock OFF

See more here: http://www.techchairman.com/2017/12/nokia-3-secret-codes.html