Secret Codes

There are the some secret codes :
For Your Nokia Mobile 

1) *#06# For checking IMEI(international Mobile Equipment Identity)
2) *#7780# Reset to factory settings
3) *#0000# To view software version
4) *#2820# Bluetooth device address
5) *#746 Shows if ur sim 025625# Sim clock allowed status
6) #pw+1234567890+1#as any restrictions
7) *#732874826337378# Reset Security Code . 


Samsung Secret Codes 
1) *#9999# or *#0837# for Software Version 
2)*#6#For IMEI 
3)*#9998*246For Battery Status and Memory Status 
4)*#9125 for smiley
5)*#89998778# for Display simcard information .
6)8#2222# for hardware version .