Here are some secret short codes you can use to access hidden features in your Nokia 3, Nokia 5 and Nokia 6 smartphone.

Gmail – *#*#36245#*#*
Typing this command will show you detailed information about the Gmail accounts linked with your device.

Google Play Services – *#*#948322243 #*#* or *#*#2884936 #*#* or *#*#2432546 #*#* or *#*# 426377962#*#*
WIth this code, you can access Google Play Services, which is an app that you will find in every Android device, be it a smartphone or a tablet, and even in an emulator.

Phone information - *#*#4636#*#*
This code will help you access or check your IMEI number, Signal strenght, cellinfo and connection type. Also you can run Ping test too

CQA Test – *#*#2486#*#*
WithCQA Test, users can access or check if their smartphone is working perfectly.

See more here: http://www.techchairman.com/2017/12/nokia-3-nokia-5-and-nokia-6-top-secret.html