Main Code #pw+(master code)+Y#
This code is able to check, activate or remove Sim card restriction (SP-lock).

Use the * key to get the p, + and w chars.
Y has to be 1,2,3 or 4 – depending of what lock you what to deal with.

#pw+1234567890+1# for Provider-Lock status
#pw+1234567890+2# for Network-Lock status
#pw+1234567890+3# for Provider(???)-Lock status
#pw+1234567890+4# for SimCard-Lock status

(master code) is a 10 digit code, based on the phones IMEI number.

update:
I get report that told me the code didn t works for Optimus Card

Enhanced Full Rate Codec (EFR)
Enhanced Full Rate will give you much better sound quality when you enable it. The new Enhanced Full Rate CODEC adopted by GSM uses the ASELP (AlgebraicCode Excitation Linear Prediction) compression technology. This technology allows for much great voice quality in the same number of bits as the older Full Rate CODEC. The older technology was called LPC-RPE (Linear Prediction Coding with Regular Pulse Excitation). Both operate at 13 kilobits.(but you take up more space on the network, so they can charge you more)

*3370# and EFR will be activated after a reboot of the phone ( consumes more power )

#3370#
and EFR will be switched off after a reboot of the phone.
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Half Rate Codec (HR)
Half Rate will give you bad sound quality, which gives the service provider the opportunity to have more calls on the network; and you might get a lower charge from them. (Will give you 30% longer talk-time)
*4720# Half Rate coded will be activated after a reboot of the phone ( better standby time )

#4720# Half Rate coded will be de-activated after a reboot of the phone
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Unblocking Code
Unblock PIN1 : **05*PUK*newPIN1*newPIN1#@
UnBlock PIN2 : **052*PUK2*newPIN2*newPIN2#@
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Hiding your phone number
Dial 141 then the number you want to call eg. 141#######
This should stop your number been sent to the caller. (*)
(*) This only works on UK phones, if anybody has tried this and works, please let me know.
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Unlocking PIN2 for software version
V 05.07
20.11.98
NSE-1

If your SimCard is locked by your SP, you can check it and if it is, you will get the “wrong code” message on the display (for use 1234567890)
If your SimCard is locked by your SP, you can t unlock PIN2 !
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Blocking phone number at Cantel AT&T

If you have one of those cantel at&t phones if you press #0000# you can block your number
at no extra charge.
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New Menu on Emergency Calls *3001#12345#

Brings a new menu that gives you access to the emergency calls ( 911 Etc. ). It will give you FREE calls! (only the ones you put in the emergency!! )

This option will depend on your GSM operator
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Your number in your display
Goto menu 3-7 Call cost settings.
Turn ON the Call costs limit 3-7-1. PIN2 code Required.
Put in the limit with the phone number.
eg. my phone # is 019 2184697
Enter the limit as 2184697
Goto menu 3-7-2 Show costs in. PIN2 code Required.
Select Currency.
Enter Unit price : 1
Enter Currency name as 019 (per my phone # eg. above)
Now the phone number 019 2184697 will remains on the 4th row of the display.
Secondly, if you press the # key, it prompt which line to be used; Line 1 or 2.

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