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Some secret code for sony ericsson you can use it.

*#06# : Show IMEI (Internasional Mobile Equipment Identity).
*#0000# : Reset language to English.
*#7465625*12*xxxxxxxx# : which xxxxxxxx is unlock code
*#7465625*XX*xxxxxxxx# : which xxxxxxxx is sim code
XX may be  :
12 for NCK lock
22 for Provider Lock
32 for Network Lock
42 for SIM code Lock
52 for Subset Lock
62 for Corporate Lock
72 for IMSI Personality (private)
99 for IMSI Range
*#9275625*11*xxxxxxxx# : which xxxxxxxx is Wap code
*#00xx# : change language (xx is your country code, Indoneisa : 62 )
*#0000000# : Reset language to default
 *#7465625 : show SIM Lock Status
*#7353273# : shown Firmware Version
*#78737322867973738# : Super Factory Reset
*#73287489263373738# : reset Security Code to 0000
*09*(PIN Code)# : activate pin code
#09*(PIN Code)# : deactivate PIN Code
<**< to Lock SIM Card so that can be used by another SIM card. To open it with unlock code.
*<<* Lock provider service.
**04*0000*0000*0000# : Accessing Hand phone without SIM card.
0# : Show the last call
> * < < * < * : Service Menu – show phone software version . press “Yes” again and again
to see all data about software and press  “>” to see all text at the phone.
< * * < : Lock SIM Card.