To see IMEI: 
press *#06#

Software Version:
Press * # 0000 # and you will see software version, manufacture date and phone model.

Warranty:
press *#92702689#, and you will see: 

1 IMEI 
2 Made MM/YY (manufacture date)
3 date of purchase (this can be edited, but once it is set, it cannot be altered anymore).
4 Repaired (date of repair, in case it has been repaired)
5 Transfer user data

EFR:
*3370# EFR will be activated once the phone is restarted (turned off, then turned on).
#3370# EFR will be deactivated once the phone is restarted. 
*4720# Half Rate will be activated once the phone is restarted.
#4720# Half Rate will be deactivated once the phone is restarted.