Sony Ericsson K750i- How to unlock your SIM Card.

Note: Most SIM cards are locked when the phone is purchased. In such a case, you have to enter
a PIN(Personal Identity Number) whenever you turn the phone on. If you make three repeated wrong
PIN entries, the SIM card gets blocked. The PIN Blocked message appears.

         You have to enter the PUK(Personal Unblocking Key) to unblock the SIM. Both PIN and PUK will be
given by your service provider. You can change the given PIN and have your own four to eight digit PIN.

To Unblock your SIM card:

        1. Wait for PIN Blocked message.

        2. Enter your PUK and Click on OK.

        3. Enter your new PIN. Click on OK.

        4. Enter your Pin again to confirm. Click on OK.

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To Edit your PIN:

        1. Go to Settings. > General tab > Locks > SIM Lock > Change PIN.

        2. Enter the given PIN > OK.

        3. Now Enter the PIN you have chosen > OK

        4. Enter the PIN again to confirm > OK.

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To turn the SIM Card on or off:

        1. Go to Settings. > General tab > Locks > SIM Lock > Protection.

          2. Select On or Off.

        3. Enter your PIN. > OK.

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