GSM Secret Codes for All Mobiles

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

Cancel all redirections: ##002# ;

*43# to activate call waiting, to deactivate #43#.

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.