Type *#61# and press call - Check callredirection status.
Cancel all redirections: ##002#
*43# to activate call waiting, to deactivate #43#.
If your phone doesn't have incoming callbarring 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 isyour 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*
Important:
If you know any other tips & tricks & secrets about GSM mobile or any other mobile which is not listed here then youcan post in Guestbook and it will be updated soon with your name.
Warning:
You can try these codes at your own responsibility ! We are not responsible for any malfunction and we don't accept any complaints.