Sony Xperia M4 Aqua - SIM Card Protection

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SIM Card Protection

You can lock and unlock each SIM card that you use in your device with a PIN (Personal

Identification Number). When a SIM card is locked, the subscription linked to the card is

protected against misuse, meaning you have to enter a PIN every time you start your

device.
If you enter the PIN incorrectly too many times, your SIM card will get blocked. You then

need to enter your PUK (Personal Unblocking Key) and a new PIN. Your PIN and PUK

are supplied by your service provider.

To Set up a SIM Card Lock

1

From the Homescreen, tap .

2

Find and tap

Settings > Security > Set up SIM card lock.

3

Drag the slider beside

Lock SIM card to the On position.

4

Enter the SIM card PIN and tap

OK. The SIM card lock is now active and you will

be prompted to enter this lock every time you restart the device.

To change the SIM card PIN

1

From the Homescreen, tap . .

2

Find and tap

Settings > Security > Set up SIM card lock.

3

Tap

Change SIM PIN.

4

Enter the old SIM card PIN and tap

OK.

5

Enter the new SIM card PIN and tap

OK.

6

Retype the new SIM card PIN and tap

OK.

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To unlock a locked SIM card

1

Enter the PUK code and tap

.

2

Enter a new PIN code and tap

.

3

Re-enter the new PIN code and tap

.

If you enter an incorrect PUK code too many times, the SIM card becomes locked. If this

happens, contact your service provider to get a new SIM card.