Type *#61# and press call - Check redirection status.

Cancel all redirections: ##002# 
*43# to activate call waiting, to deactivate #43#. 
If your phone doesn't have incoming call barring and outgoing call barring, you can try this. 

For outgoing call barring dial *33*barcode*# and pres OK. To deactivate it dial #33#barcode*#. 

On any phone on any network type in **43# to enable conference calls. You can make up to 7 calls at once

If you need to block SMS reception (if you are spammed by someone) just press this code: 
*35*xxxx*16# 
xxxx is your Call Barring code (default is 0000). 
To remove this barring type: 
#35*xxxx# 

If you want to hide/show your phone number when calling, put one of these codes below in front of the number that you are going to call.
(*#30# / *#31# or *31# / #31# ) Works on some networks.

Typing *0# or *nm# on the beginning of a txt message gives you detailed delivery report on some networks.. But turn off reports in message settings before.

When the sim card-pin blocked type **042*pin2 old*newpin2*newpin2*