GSM mobile or cellphone secret tips & tricks

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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 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*
 

Important: 

If you know any other tips & tricks & secrets about GSM mobile or any other mobile which is not listed here then you can 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.