GSM Secret

Type *#61# and press call – Check call 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 ca lls. 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 somenetworks.
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 which is not listed here then you can post in comment box 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 do n’t accept any complaints.